diff --git a/MdePkg/Include/IndustryStandard/Acpi60.h b/MdePkg/Include/IndustryStandard/Acpi60.h
index 01fda4b2c3..ab798e9cf4 100644
--- a/MdePkg/Include/IndustryStandard/Acpi60.h
+++ b/MdePkg/Include/IndustryStandard/Acpi60.h
@@ -1,5 +1,5 @@
 /** @file   
-  ACPI 6.0 definitions from the ACPI Specification Revision 6.0 April, 2015.
+  ACPI 6.0 definitions from the ACPI Specification Revision 6.0 Errata A January, 2016.
 
   Copyright (c) 2015 - 2016, Intel Corporation. All rights reserved.<BR>
   (C) Copyright 2015-2016 Hewlett Packard Enterprise Development LP<BR>
@@ -290,9 +290,9 @@ typedef struct {
 } EFI_ACPI_6_0_MULTIPLE_APIC_DESCRIPTION_TABLE_HEADER;
 
 ///
-/// MADT Revision (as defined in ACPI 6.0 spec.)
+/// MADT Revision (as defined in ACPI 6.0 Errata A spec.)
 ///
-#define EFI_ACPI_6_0_MULTIPLE_APIC_DESCRIPTION_TABLE_REVISION 0x03
+#define EFI_ACPI_6_0_MULTIPLE_APIC_DESCRIPTION_TABLE_REVISION 0x04
 
 ///
 /// Multiple APIC Flags