diff --git a/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLibInternals.h b/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLibInternals.h
index 0bfb503337..4df3fa388d 100644
--- a/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLibInternals.h
+++ b/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLibInternals.h
@@ -230,6 +230,7 @@ Decode (
   @param  Scratch     A temporary scratch buffer that is used to perform the decompression.
                       This is an optional parameter that may be NULL if the
                       required scratch buffer size is 0.
+  @param  Version     1 for UEFI Decompress algoruthm, 2 for Tiano Decompess algorithm.
 
   @retval  RETURN_SUCCESS Decompression completed successfully, and
                           the uncompressed buffer is returned in Destination.