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diff --git a/MdePkg/Include/Protocol/Capsule.h b/MdePkg/Include/Protocol/Capsule.h
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+++ b/MdePkg/Include/Protocol/Capsule.h
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+/** @file
+  Capsule Architectural Protocol as defined in PI1.0a Specification VOLUME 2 DXE
+
+  The DXE Driver that produces this protocol must be a runtime driver. 
+  The driver is responsible for initializing the CapsuleUpdate() and 
+  QueryCapsuleCapabilities() fields of the UEFI Runtime Services Table. 
+  After the two fields of the UEFI Runtime Services Table have been initialized, 
+  the driver must install the EFI_CAPSULE_ARCH_PROTOCOL_GUID on a new handle 
+  with a NULL interface pointer. The installation of this protocol informs 
+  the DXE Foundation that the Capsule related services are now available and 
+  that the DXE Foundation must update the 32-bit CRC of the UEFI Runtime Services Table.
+
+Copyright (c) 2006 - 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
+which accompanies this distribution.  The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef __ARCH_PROTOCOL_CAPSULE_ARCH_H__
+#define __ARCH_PROTOCOL_CAPSULE_ARCH_H__
+
+//
+// Global ID for the Capsule Architectural Protocol
+//
+#define EFI_CAPSULE_ARCH_PROTOCOL_GUID \
+  { 0x5053697e, 0x2cbc, 0x4819, {0x90, 0xd9, 0x05, 0x80, 0xde, 0xee, 0x57, 0x54 }}
+
+extern EFI_GUID gEfiCapsuleArchProtocolGuid;
+
+#endif