diff --git a/MdePkg/Include/Register/Intel/ArchitecturalMsr.h b/MdePkg/Include/Register/Intel/ArchitecturalMsr.h
index 4715c59dc48d..faabf0c4331b 100644
--- a/MdePkg/Include/Register/Intel/ArchitecturalMsr.h
+++ b/MdePkg/Include/Register/Intel/ArchitecturalMsr.h
@@ -2103,6 +2103,13 @@ typedef union {
 #define MSR_IA32_MTRR_PHYSBASE9  0x00000212
 /// @}
 
+#define MSR_IA32_MTRR_CACHE_UNCACHEABLE      0
+#define MSR_IA32_MTRR_CACHE_WRITE_COMBINING  1
+#define MSR_IA32_MTRR_CACHE_WRITE_THROUGH    4
+#define MSR_IA32_MTRR_CACHE_WRITE_PROTECTED  5
+#define MSR_IA32_MTRR_CACHE_WRITE_BACK       6
+#define MSR_IA32_MTRR_CACHE_INVALID_TYPE     7
+
 /**
   MSR information returned for MSR indexes #MSR_IA32_MTRR_PHYSBASE0 to
   #MSR_IA32_MTRR_PHYSBASE9