diff --git a/MdePkg/Library/BaseExtractGuidedSectionLib/BaseExtractGuidedSectionLib.inf b/MdePkg/Library/BaseExtractGuidedSectionLib/BaseExtractGuidedSectionLib.inf
index 81aad6c4f5..ffa2c5fddd 100644
--- a/MdePkg/Library/BaseExtractGuidedSectionLib/BaseExtractGuidedSectionLib.inf
+++ b/MdePkg/Library/BaseExtractGuidedSectionLib/BaseExtractGuidedSectionLib.inf
@@ -1,10 +1,14 @@
 ## @file
 #  Base ExtractGuidedSection Library.
 #  This instance can also be used in SEC phase only when the memory is ready in SEC phase.
-#  PCD PcdGuidedExtractHandlerTableAddress points to the available memory address 
-#  to store Guided Extract Handlers.
+#  PCD PcdGuidedExtractHandlerTableAddress points to the available pysical memory space 
+#  that is used to store Guided Extract Handlers.
+#  Note: A driver of type DXE_RUNTIME_DRIVER can use this ExtractGuidedSectionLib 
+#  in their initialization without any issues. They only have to be careful in 
+#  the implementation of runtime services, because this BASE library instance doesn't 
+#  convert the address pointed by PcdGuidedExtractHandlerTableAddress to the virtual address.
 #  
-#  Copyright (c) 2007 - 2010, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2007 - 2011, Intel Corporation. All rights reserved.<BR>
 #
 #  This program and the accompanying materials
 #  are licensed and made available under the terms and conditions of the BSD License