1 files changed, 3 insertions, 2 deletions
diff --git a/edk2/MdePkg/Include/Protocol/UnicodeCollation.h b/edk2/MdePkg/Include/Protocol/UnicodeCollation.h
index f45c9ead0..e9eef6121 100644
--- a/edk2/MdePkg/Include/Protocol/UnicodeCollation.h
+++ b/edk2/MdePkg/Include/Protocol/UnicodeCollation.h
@@ -179,8 +179,9 @@ struct _EFI_UNICODE_COLLATION_PROTOCOL {
   EFI_UNICODE_COLLATION_STRTOFAT    StrToFat;
   
   ///
-  /// A Null-terminated ASCII string array that contains one or more 
-  /// language codes. This array is specified in RFC 4646 format.
+  /// A Null-terminated ASCII string array that contains one or more language codes.
+  /// When this field is used for UnicodeCollation2, it is specified in RFC 4646 format.
+  /// When it is used for UnicodeCollation, it is specified in ISO 639-2 format.
   ///
   CHAR8                             *SupportedLanguages;
 };