diff --git a/MdePkg/Include/Pi/PiDependency.h b/MdePkg/Include/Pi/PiDependency.h
index 952867937f..1db03af8fc 100644
--- a/MdePkg/Include/Pi/PiDependency.h
+++ b/MdePkg/Include/Pi/PiDependency.h
@@ -40,7 +40,7 @@
 
 /// 
 /// If present, this must be the first opcode,
-/// EFI_DEP_SOR may be used by DXE and SMM drivers.
+/// EFI_DEP_SOR is only used by DXE driver.
 /// 
 #define EFI_DEP_SOR           0x09