diff --git a/cell.go b/cell.go
index 69f8697..e1bb91d 100644
--- a/cell.go
+++ b/cell.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import (
diff --git a/chart.go b/chart.go
index 4b73c3b..a84e0f6 100644
--- a/chart.go
+++ b/chart.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import (
diff --git a/col.go b/col.go
index a2d7e69..c7ab9e3 100644
--- a/col.go
+++ b/col.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import (
diff --git a/comment.go b/comment.go
index 241261c..c87e08c 100644
--- a/comment.go
+++ b/comment.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import (
diff --git a/datavalidation.go b/datavalidation.go
index 6648556..69f67b1 100644
--- a/datavalidation.go
+++ b/datavalidation.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import (
diff --git a/datavalidation_test.go b/datavalidation_test.go
index 7d10024..b9c51ad 100644
--- a/datavalidation_test.go
+++ b/datavalidation_test.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import "testing"
diff --git a/date.go b/date.go
index 4ef0559..c67c3a1 100644
--- a/date.go
+++ b/date.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import (
diff --git a/excelize.go b/excelize.go
index 4f45784..93596d8 100644
--- a/excelize.go
+++ b/excelize.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import (
diff --git a/file.go b/file.go
index 350f753..582228f 100644
--- a/file.go
+++ b/file.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import (
diff --git a/hsl.go b/hsl.go
index d8fc87d..77946ac 100644
--- a/hsl.go
+++ b/hsl.go
@@ -1,37 +1,35 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright (c) 2012 Rodrigo Moraes. All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-	 * Redistributions of source code must retain the above copyright
-notice, this list of conditions and the following disclaimer.
-	 * Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the following disclaimer
-in the documentation and/or other materials provided with the
-distribution.
-	 * Neither the name of Google Inc. nor the names of its
-contributors may be used to endorse or promote products derived from
-this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
+// Copyright (c) 2012 Rodrigo Moraes. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// 	 * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// 	 * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// 	 * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import (
diff --git a/lib.go b/lib.go
index c4cd95b..1493039 100644
--- a/lib.go
+++ b/lib.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import (
diff --git a/picture.go b/picture.go
index e473498..16b428f 100644
--- a/picture.go
+++ b/picture.go
@@ -1,11 +1,11 @@
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
 // Package excelize providing a set of functions that allow you to write to
 // and read from XLSX files. Support reads and writes XLSX file generated by
 // Microsoft Excel™ 2007 and later. Support save file without losing original
 // charts of XLSX. This library needs Go version 1.8 or later.
-//
-// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-// this source code is governed by a BSD-style license that can be found in
-// the LICENSE file.
 package excelize
 
 import (
diff --git a/rows.go b/rows.go
index aa8b2a6..84dc6d8 100644
--- a/rows.go
+++ b/rows.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import (
diff --git a/shape.go b/shape.go
index 12cb725..dcdf6d9 100644
--- a/shape.go
+++ b/shape.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import (
diff --git a/sheet.go b/sheet.go
index a8d5ed7..97bb9b2 100644
--- a/sheet.go
+++ b/sheet.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import (
diff --git a/sheetpr.go b/sheetpr.go
index 4216cb9..6f77f6f 100644
--- a/sheetpr.go
+++ b/sheetpr.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 // SheetPrOption is an option of a view of a worksheet. See SetSheetPrOptions().
diff --git a/sheetview.go b/sheetview.go
index 62b35a1..b3ef477 100644
--- a/sheetview.go
+++ b/sheetview.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import "fmt"
diff --git a/styles.go b/styles.go
index ba5af3d..e9da3b3 100644
--- a/styles.go
+++ b/styles.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import (
diff --git a/table.go b/table.go
index a7b71ed..e5d8785 100644
--- a/table.go
+++ b/table.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import (
diff --git a/templates.go b/templates.go
index 5f62f46..f648fc8 100644
--- a/templates.go
+++ b/templates.go
@@ -1,16 +1,14 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-
-This file contains default templates for XML files we don't yet populated
-based on content.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
+//
+// This file contains default templates for XML files we don't yet populated
+// based on content.
 package excelize
 
 // XMLHeader define an XML declaration can also contain a standalone declaration.
diff --git a/vmlDrawing.go b/vmlDrawing.go
index 768ca2f..305a689 100644
--- a/vmlDrawing.go
+++ b/vmlDrawing.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import "encoding/xml"
diff --git a/xmlChart.go b/xmlChart.go
index 72ad4ce..9dcec1e 100644
--- a/xmlChart.go
+++ b/xmlChart.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import "encoding/xml"
diff --git a/xmlComments.go b/xmlComments.go
index f16128d..b3cb575 100644
--- a/xmlComments.go
+++ b/xmlComments.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import "encoding/xml"
diff --git a/xmlContentTypes.go b/xmlContentTypes.go
index 6abd0e6..efbca78 100644
--- a/xmlContentTypes.go
+++ b/xmlContentTypes.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import "encoding/xml"
diff --git a/xmlDecodeDrawing.go b/xmlDecodeDrawing.go
index c66176c..8051140 100644
--- a/xmlDecodeDrawing.go
+++ b/xmlDecodeDrawing.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import "encoding/xml"
diff --git a/xmlDrawing.go b/xmlDrawing.go
index 633856a..e71932b 100644
--- a/xmlDrawing.go
+++ b/xmlDrawing.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import "encoding/xml"
diff --git a/xmlSharedStrings.go b/xmlSharedStrings.go
index 1f31f99..9fc8579 100644
--- a/xmlSharedStrings.go
+++ b/xmlSharedStrings.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import "encoding/xml"
diff --git a/xmlStyles.go b/xmlStyles.go
index 5b3c9e0..67785ed 100644
--- a/xmlStyles.go
+++ b/xmlStyles.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import "encoding/xml"
diff --git a/xmlTable.go b/xmlTable.go
index 3949d49..a5d8673 100644
--- a/xmlTable.go
+++ b/xmlTable.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import "encoding/xml"
diff --git a/xmlTheme.go b/xmlTheme.go
index b9dd2bb..146ca3a 100644
--- a/xmlTheme.go
+++ b/xmlTheme.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import "encoding/xml"
diff --git a/xmlWorkbook.go b/xmlWorkbook.go
index ca17d03..2e3ab47 100644
--- a/xmlWorkbook.go
+++ b/xmlWorkbook.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import "encoding/xml"
diff --git a/xmlWorksheet.go b/xmlWorksheet.go
index c481a6d..8868cec 100644
--- a/xmlWorksheet.go
+++ b/xmlWorksheet.go
@@ -1,13 +1,11 @@
-/*
-Package excelize providing a set of functions that allow you to write to
-and read from XLSX files. Support reads and writes XLSX file generated by
-Microsoft Excel™ 2007 and later. Support save file without losing original
-charts of XLSX. This library needs Go version 1.8 or later.
-
-Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
-this source code is governed by a BSD-style license that can be found in
-the LICENSE file.
-*/
+// Copyright 2016 - 2018 The excelize Authors. All rights reserved. Use of
+// this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+//
+// Package excelize providing a set of functions that allow you to write to
+// and read from XLSX files. Support reads and writes XLSX file generated by
+// Microsoft Excel™ 2007 and later. Support save file without losing original
+// charts of XLSX. This library needs Go version 1.8 or later.
 package excelize
 
 import "encoding/xml"