diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index 17b7d423ad..b8dd9feb72 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -3,7 +3,7 @@
 # This Package provides all definitions(including functions, MACROs, structures and library classes)
 # and libraries instances, which are defined in MDE Specification.
 # It also provides the definitions(including PPIs/PROTOCOLs/GUIDs) of
-# EFI1.10/UEFI2.3/PI1.2 and some Industry Standards.
+# EFI1.10/UEFI2.3.1/PI1.2 and some Industry Standards.
 #
 # Copyright (c) 2007 - 2011, Intel Corporation. All rights reserved.<BR>
 # Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>