1 files changed, 15 insertions, 4 deletions
diff --git a/MdePkg/Library/DxePcdLib/DxePcdLib.inf b/MdePkg/Library/DxePcdLib/DxePcdLib.inf
index cd2a1c8e17..2958ed0a7c 100644
--- a/MdePkg/Library/DxePcdLib/DxePcdLib.inf
+++ b/MdePkg/Library/DxePcdLib/DxePcdLib.inf
@@ -1,9 +1,19 @@
 #/** @file
 # Instance of PCD Library using PCD Protocol.
 #
-# PCD Library that uses the PCD Protocol to access Dynamic and DynamicEx PCD entries.
+# There are two PCD PPIs as follows:
+#   1) PCD_PROTOCOL
+#      It is EDKII implementation which support Dynamic/DynamicEx Pcds.
+#   2) EFI_PCD_PROTOCOL
+#      It is defined by PI specification 1.2, Vol 3 which only support dynamicEx 
+#      type Pcd.
 #
-# Copyright (c) 2007 - 2008, Intel Corporation.
+# For dynamicEx type PCD, it is compatible between PCD_PROTOCOL and EFI_PCD_PROTOCOL.
+#
+# This library instance uses the PCD_PROTOCOL to handle dynamic PCD request and use
+# EFI_PCD_PROTOCOL to handle dynamicEx type PCD.
+#
+# Copyright (c) 2007 - 2009, Intel Corporation.
 #
 #  All rights reserved. This program and the accompanying materials
 #  are licensed and made available under the terms and conditions of the BSD License
@@ -44,7 +54,8 @@
 
 [Protocols]
   gPcdProtocolGuid                              ## CONSUMES
-
+  gEfiPcdProtocolGuid                           ## CONSUMES
+  
 [Depex]
-  gPcdProtocolGuid
+  gEfiPcdProtocolGuid