diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index 6540a33cb1..70ba9b1c9c 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -261,8 +261,9 @@
   #  FALSE is for size reduction.
   gEfiMdeModulePkgTokenSpaceGuid.PcdSupportHiiImageProtocol|TRUE|BOOLEAN|0x00010100
   
-  ## If TRUE, Full UEFI Config Routing Protocol will be installed.
-  #  FALSE is for size reduction.
+  ## If TRUE, these interface in EFI_HII_CONFIG_ROUTING_PROTOCOL will be supported: ExtractConfig, ExportConfig, RouteConfig 
+  # and GetAltCfg will be supported. Otherwise, these interface will return EFI_UNSUPPORTED.
+  # FALSE is for size reduction.
   gEfiMdeModulePkgTokenSpaceGuid.PcdSupportFullConfigRoutingProtocol|TRUE|BOOLEAN|0x00010101
   
   ## If TRUE, USB KeyBoard Driver disables the default keyboard layout.