diff --git a/MdeModulePkg/Application/VariableInfo/VariableInfo.c b/MdeModulePkg/Application/VariableInfo/VariableInfo.c
index ba4f553f49..ac92cc3b79 100644
--- a/MdeModulePkg/Application/VariableInfo/VariableInfo.c
+++ b/MdeModulePkg/Application/VariableInfo/VariableInfo.c
@@ -82,6 +82,13 @@ UefiMain (
       VariableInfo = VariableInfo->Next;
     } while (VariableInfo != NULL);
 
+  } else {
+    Print (L"Warning: Variable Dxe driver doesn't enable the feature of statistical information!\n");
+    Print (L"If you want to see this info, please:\n");
+    Print (L"  1. Set PcdVariableCollectStatistics as TRUE\n");
+    Print (L"  2. Rebuild Variable Dxe driver\n");
+    Print (L"  3. Run \"VariableInfo\" cmd again\n");
+
   }
 
   return Status;
diff --git a/MdeModulePkg/Application/VariableInfo/VariableInfo.inf b/MdeModulePkg/Application/VariableInfo/VariableInfo.inf
index f963db5719..7cadb231ed 100644
--- a/MdeModulePkg/Application/VariableInfo/VariableInfo.inf
+++ b/MdeModulePkg/Application/VariableInfo/VariableInfo.inf
@@ -2,7 +2,9 @@
 #  Sample UEFI Application Reference Module.
 #  This is a shell application that will display statistical information about variable
 #  usage.
-# 
+#  Note that if Variable Dxe driver doesn't enable the feature by setting PcdVariableCollectStatistics
+#  as TRUE, The application will not display variable statistical information.
+#
 #  Copyright (c) 2007 - 2008, Intel Corporation.
 #  All rights reserved. This program and the accompanying materials
 #  are licensed and made available under the terms and conditions of the BSD License
diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index 0c8de2b5ca..8fdf10d3b5 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -169,7 +169,9 @@
     
   ## If TRUE, enable the statistic functionality about variable usage. Such information is
   #  stored as a vendor configuration table into the EFI system table.
-  #  If user wants to get variable usage info, this pcd should be set as TRUE.
+  #  If user wants to use VariableInfo application in MdeModulePkg\Application directory to get
+  #  variable usage info, this pcd should be set as TRUE. Otherwise VariableInfo application can 
+  #  not output useful info.
   gEfiMdeModulePkgTokenSpaceGuid.PcdVariableCollectStatistics|FALSE|BOOLEAN|0x0001003f
   
   ## If TRUE, Unicode Collation Protocol will be installed.