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diff --git a/roms/edk2/MdePkg/Include/Library/UefiRuntimeServicesTableLib.h b/roms/edk2/MdePkg/Include/Library/UefiRuntimeServicesTableLib.h
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index 000000000..39212ee23
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+++ b/roms/edk2/MdePkg/Include/Library/UefiRuntimeServicesTableLib.h
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+/** @file
+  Provides a service to retrieve a pointer to the EFI Runtime Services Table.
+
+  This library does not contain any functions or macros.  It simply exports the
+  global variable gRT that is a pointer to the EFI Runtime Services Table as defined
+  in the UEFI Specification.  The global variable gRT must be preinitialized to NULL.
+  The library constructor must set gRT to point at the EFI Runtime Services Table so
+  it is available at the module's entry point. Since there is overhead in initializing
+  this global variable, only those modules that actually require access to the EFI
+  Runtime Services Table should use this library.
+  Only available to DXE and UEFI module types.
+
+Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef __UEFI_RUNTIME_SERVICES_TABLE_LIB_H__
+#define __UEFI_RUNTIME_SERVICES_TABLE_LIB_H__
+
+///
+/// Cached copy of the EFI Runtime Services Table
+///
+extern EFI_RUNTIME_SERVICES  *gRT;
+
+#endif