diff --git a/MdePkg/Include/Library/DebugLib.h b/MdePkg/Include/Library/DebugLib.h
index 5bab0abc20..cfd14373c1 100644
--- a/MdePkg/Include/Library/DebugLib.h
+++ b/MdePkg/Include/Library/DebugLib.h
@@ -42,7 +42,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 #define DEBUG_POOL      0x00000010  // Alloc & Free's
 #define DEBUG_PAGE      0x00000020  // Alloc & Free's
 #define DEBUG_INFO      0x00000040  // Verbose
-#define DEBUG_DISPATCH  0x00000080  // PEI/DXE Dispatchers
+#define DEBUG_DISPATCH  0x00000080  // PEI/DXE/SMM Dispatchers
 #define DEBUG_VARIABLE  0x00000100  // Variable
 #define DEBUG_BM        0x00000400  // Boot Manager
 #define DEBUG_BLKIO     0x00001000  // BlkIo Driver
diff --git a/MdePkg/Include/Pi/PiDependency.h b/MdePkg/Include/Pi/PiDependency.h
index 6f07c426fe..952867937f 100644
--- a/MdePkg/Include/Pi/PiDependency.h
+++ b/MdePkg/Include/Pi/PiDependency.h
@@ -19,13 +19,13 @@
 
 /// 
 /// If present, this must be the first and only opcode,
-/// EFI_DEP_BEFORE is only used by DXE driver.
+/// EFI_DEP_BEFORE may be used by DXE and SMM drivers.
 /// 
 #define EFI_DEP_BEFORE        0x00
 
 /// 
 /// If present, this must be the first and only opcode,
-/// EFI_DEP_AFTER is only used by DXE driver.
+/// EFI_DEP_AFTER may be used by DXE and SMM drivers.
 /// 
 #define EFI_DEP_AFTER         0x01
 
@@ -40,7 +40,7 @@
 
 /// 
 /// If present, this must be the first opcode,
-/// EFI_DEP_SOR is only used by DXE driver.
+/// EFI_DEP_SOR may be used by DXE and SMM drivers.
 /// 
 #define EFI_DEP_SOR           0x09