diff --git a/README.md b/README.md
index 298772b..ef6f7ed 100644
--- a/README.md
+++ b/README.md
@@ -62,6 +62,8 @@ package main
 
 import (
     "fmt"
+    "os"
+    
     "github.com/Luxurioust/excelize"
 )
 
@@ -92,6 +94,8 @@ package main
 
 import (
     "fmt"
+    "os"
+    
     "github.com/Luxurioust/excelize"
 )