diff --git a/MdePkg/Include/Common/StatusCode.h b/MdePkg/Include/Common/StatusCode.h
index 6e2b71a218..af23a0ae11 100644
--- a/MdePkg/Include/Common/StatusCode.h
+++ b/MdePkg/Include/Common/StatusCode.h
@@ -96,7 +96,7 @@ typedef struct {
 // Class definitions
 // Values of 4-127 are reserved for future use by this
 // specification.
-// Values in the range 127-255 are reserved for OEM use.
+// Values in the range 128-255 are reserved for OEM use.
 //
 #define EFI_COMPUTING_UNIT  0x00000000
 #define EFI_PERIPHERAL      0x01000000
@@ -118,7 +118,7 @@ typedef struct {
 ///////////////////////////////////////////////////////////////////////////////
 //
 // Computing Unit Subclass definitions.
-// Values of 8-127 are reserved for future use by this
+// Values of 7-127 are reserved for future use by this
 // specification.
 // Values of 128-255 are reserved for OEM use.
 //
@@ -252,7 +252,7 @@ typedef struct {
 ///////////////////////////////////////////////////////////////////////////////
 //
 // Peripheral Subclass definitions.
-// Values of 12-127 are reserved for future use by this
+// Values of 13-127 are reserved for future use by this
 // specification.
 // Values of 128-255 are reserved for OEM use.
 //
@@ -393,7 +393,7 @@ typedef struct {
 ///////////////////////////////////////////////////////////////////////////////
 //
 // IO Bus Subclass definitions.
-// Values of 14-127 are reserved for future use by this
+// Values of 13-127 are reserved for future use by this
 // specification.
 // Values of 128-255 are reserved for OEM use.
 //
@@ -537,7 +537,7 @@ typedef struct {
 ///////////////////////////////////////////////////////////////////////////////
 //
 // Software Subclass definitions.
-// Values of 14-127 are reserved for future use by this
+// Values of 20-127 are reserved for future use by this
 // specification.
 // Values of 128-255 are reserved for OEM use.
 //