diff --git a/docs/en/Blob-Storing-Custom-Provider.md b/docs/en/Blob-Storing-Custom-Provider.md
index 281e5b32e1..fc41973fdb 100644
--- a/docs/en/Blob-Storing-Custom-Provider.md
+++ b/docs/en/Blob-Storing-Custom-Provider.md
@@ -115,7 +115,7 @@ Configure<AbpBlobStoringOptions>(options =>
 
 Then you can change the `MyBlobContainerConfigurationExtensions` class like that:
 
-````
+````csharp
 public static class MyBlobContainerConfigurationExtensions
 {
     public static BlobContainerConfiguration UseMyCustomBlobProvider(