diff --git a/MdePkg/Include/Guid/FirmwareContentsSigned.h b/MdePkg/Include/Guid/FirmwareContentsSigned.h
new file mode 100644
index 0000000000..5f9d247052
--- /dev/null
+++ b/MdePkg/Include/Guid/FirmwareContentsSigned.h
@@ -0,0 +1,26 @@
+/** @file
+  GUID is used to define the signed section.
+
+  Copyright (c) 2013, 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         
+  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.             
+
+  @par Revision Reference:
+  GUID introduced in PI Version 1.2.1.
+
+**/
+
+#ifndef __FIRMWARE_CONTENTS_SIGNED_GUID_H__
+#define __FIRMWARE_CONTENTS_SIGNED_GUID_H__
+
+#define EFI_FIRMWARE_CONTENTS_SIGNED_GUID \
+   { 0xf9d89e8, 0x9259, 0x4f76, {0xa5, 0xaf, 0xc, 0x89, 0xe3, 0x40, 0x23, 0xdf } }
+
+extern EFI_GUID gEfiFirmwareContentsSignedGuid;
+
+#endif
diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index 16c278aec3..0078eda9e8 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -589,6 +589,9 @@
   #
   ## Include/Guid/EventGroup.h
   gEfiEndOfDxeEventGroupGuid        = { 0x2ce967a, 0xdd7e, 0x4ffc, { 0x9e, 0xe7, 0x81, 0xc, 0xf0, 0x47, 0x8, 0x80 }}
+  
+  ## Include/Guid/FirmwareContentsSigned.h
+  gEfiFirmwareContentsSignedGuid    = { 0xf9d89e8, 0x9259, 0x4f76, { 0xa5, 0xaf, 0xc, 0x89, 0xe3, 0x40, 0x23, 0xdf }}
 
 [Guids.IA32, Guids.X64]
   ## Include/Guid/Cper.h