diff --git a/IntelFrameworkPkg/Library/DxeIoLibCpuIo/DxeCpuIoLibInternal.h b/IntelFrameworkPkg/Library/DxeIoLibCpuIo/DxeCpuIoLibInternal.h
index 0a0e143071..3f71fa6304 100644
--- a/IntelFrameworkPkg/Library/DxeIoLibCpuIo/DxeCpuIoLibInternal.h
+++ b/IntelFrameworkPkg/Library/DxeIoLibCpuIo/DxeCpuIoLibInternal.h
@@ -1,6 +1,9 @@
 /** @file
   Internal include file of DXE CPU IO Library.
-
+  It includes all necessary protocol/library class's header file
+  for implementation of IoLib library instance. It is included 
+  all source code of this library instance.
+  
   Copyright (c) 2006, 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
diff --git a/IntelFrameworkPkg/Library/DxeIoLibCpuIo/IoLib.c b/IntelFrameworkPkg/Library/DxeIoLibCpuIo/IoLib.c
index 6aeee32cc4..808933f3fa 100644
--- a/IntelFrameworkPkg/Library/DxeIoLibCpuIo/IoLib.c
+++ b/IntelFrameworkPkg/Library/DxeIoLibCpuIo/IoLib.c
@@ -1,6 +1,8 @@
 /** @file
   I/O Library.
-
+  The implementation of I/O operation for this library instance 
+  are based on EFI_CPU_IO_PROTOCOL.
+  
   Copyright (c) 2006, Intel Corporation<BR>
   All rights reserved. This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License