diff --git a/MdePkg/Include/Uefi/UefiSpec.h b/MdePkg/Include/Uefi/UefiSpec.h
index 79fc8c72ca..69c97bdb2a 100644
--- a/MdePkg/Include/Uefi/UefiSpec.h
+++ b/MdePkg/Include/Uefi/UefiSpec.h
@@ -1839,21 +1839,23 @@ EFI_STATUS
 //
 // EFI Runtime Services Table
 //
-#define EFI_SYSTEM_TABLE_SIGNATURE      SIGNATURE_64 ('I','B','I',' ','S','Y','S','T')
-#define EFI_2_80_SYSTEM_TABLE_REVISION  ((2 << 16) | (80))
-#define EFI_2_70_SYSTEM_TABLE_REVISION  ((2 << 16) | (70))
-#define EFI_2_60_SYSTEM_TABLE_REVISION  ((2 << 16) | (60))
-#define EFI_2_50_SYSTEM_TABLE_REVISION  ((2 << 16) | (50))
-#define EFI_2_40_SYSTEM_TABLE_REVISION  ((2 << 16) | (40))
-#define EFI_2_31_SYSTEM_TABLE_REVISION  ((2 << 16) | (31))
-#define EFI_2_30_SYSTEM_TABLE_REVISION  ((2 << 16) | (30))
-#define EFI_2_20_SYSTEM_TABLE_REVISION  ((2 << 16) | (20))
-#define EFI_2_10_SYSTEM_TABLE_REVISION  ((2 << 16) | (10))
-#define EFI_2_00_SYSTEM_TABLE_REVISION  ((2 << 16) | (00))
-#define EFI_1_10_SYSTEM_TABLE_REVISION  ((1 << 16) | (10))
-#define EFI_1_02_SYSTEM_TABLE_REVISION  ((1 << 16) | (02))
-#define EFI_SYSTEM_TABLE_REVISION       EFI_2_70_SYSTEM_TABLE_REVISION
-#define EFI_SPECIFICATION_VERSION       EFI_SYSTEM_TABLE_REVISION
+#define EFI_SYSTEM_TABLE_SIGNATURE       SIGNATURE_64 ('I','B','I',' ','S','Y','S','T')
+#define EFI_2_100_SYSTEM_TABLE_REVISION  ((2 << 16) | (100))
+#define EFI_2_90_SYSTEM_TABLE_REVISION   ((2 << 16) | (90))
+#define EFI_2_80_SYSTEM_TABLE_REVISION   ((2 << 16) | (80))
+#define EFI_2_70_SYSTEM_TABLE_REVISION   ((2 << 16) | (70))
+#define EFI_2_60_SYSTEM_TABLE_REVISION   ((2 << 16) | (60))
+#define EFI_2_50_SYSTEM_TABLE_REVISION   ((2 << 16) | (50))
+#define EFI_2_40_SYSTEM_TABLE_REVISION   ((2 << 16) | (40))
+#define EFI_2_31_SYSTEM_TABLE_REVISION   ((2 << 16) | (31))
+#define EFI_2_30_SYSTEM_TABLE_REVISION   ((2 << 16) | (30))
+#define EFI_2_20_SYSTEM_TABLE_REVISION   ((2 << 16) | (20))
+#define EFI_2_10_SYSTEM_TABLE_REVISION   ((2 << 16) | (10))
+#define EFI_2_00_SYSTEM_TABLE_REVISION   ((2 << 16) | (00))
+#define EFI_1_10_SYSTEM_TABLE_REVISION   ((1 << 16) | (10))
+#define EFI_1_02_SYSTEM_TABLE_REVISION   ((1 << 16) | (02))
+#define EFI_SYSTEM_TABLE_REVISION        EFI_2_70_SYSTEM_TABLE_REVISION
+#define EFI_SPECIFICATION_VERSION        EFI_SYSTEM_TABLE_REVISION
 
 #define EFI_RUNTIME_SERVICES_SIGNATURE  SIGNATURE_64 ('R','U','N','T','S','E','R','V')
 #define EFI_RUNTIME_SERVICES_REVISION   EFI_SPECIFICATION_VERSION