diff --git a/MdePkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c b/MdePkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c
index da866610da..38051a9173 100644
--- a/MdePkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c
+++ b/MdePkg/Library/PeiServicesTablePointerLib/PeiServicesTablePointer.c
@@ -22,8 +22,7 @@
 STATIC EFI_PEI_SERVICES  **gPeiServices;
 
 /**
-  The function set the pointer of PEI services immediately preceding the IDT table
-  according to PI specification.
+  The function cache the pointer of PEI services to global variable.
   
   @param    PeiServices   The address of PeiServices pointer.
 **/