diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index 603e498676..3c61a8fabc 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -2,7 +2,7 @@
 # This Package provides all definitions, library classes and libraries instances.
 #
 # It also provides the definitions(including PPIs/PROTOCOLs/GUIDs) of
-# EFI1.10/UEFI2.7/PI1.4 and some Industry Standards.
+# EFI1.10/UEFI2.7/PI1.6 and some Industry Standards.
 #
 # Copyright (c) 2007 - 2017, Intel Corporation. All rights reserved.<BR>
 # Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>