diff --git a/MdePkg/Include/Library/DebugPrintErrorLevelLib.h b/MdePkg/Include/Library/DebugPrintErrorLevelLib.h
index 1e6bd65ba5..2b051f4210 100644
--- a/MdePkg/Include/Library/DebugPrintErrorLevelLib.h
+++ b/MdePkg/Include/Library/DebugPrintErrorLevelLib.h
@@ -11,6 +11,8 @@
   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
 **/
+#ifndef _DEBUG_PRINT_ERROR_LEVEL_LIB_H_
+#define _DEBUG_PRINT_ERROR_LEVEL_LIB_H_
 
 /**
   Returns the debug print error level mask for the current module.
@@ -26,9 +28,11 @@ GetDebugPrintErrorLevel (
 
 /**
   Sets the global debug print error level mask fpr the entire platform.
-
-  @retval  TRUE   The debug print error level mask was sucessfully set.
-  @retval  FALSE  The debug print error level mask could not be set.
+  
+  @param   ErrorLevel     Global debug print error level
+  
+  @retval  TRUE           The debug print error level mask was sucessfully set.
+  @retval  FALSE          The debug print error level mask could not be set.
 
 **/
 BOOLEAN
@@ -36,3 +40,4 @@ EFIAPI
 SetDebugPrintErrorLevel (
   UINT32  ErrorLevel
   );
+#endif
diff --git a/MdePkg/Library/BaseDebugPrintErrorLevelLib/BaseDebugPrintErrorLevelLib.c b/MdePkg/Library/BaseDebugPrintErrorLevelLib/BaseDebugPrintErrorLevelLib.c
index df4612e051..7af127f99f 100644
--- a/MdePkg/Library/BaseDebugPrintErrorLevelLib/BaseDebugPrintErrorLevelLib.c
+++ b/MdePkg/Library/BaseDebugPrintErrorLevelLib/BaseDebugPrintErrorLevelLib.c
@@ -38,9 +38,11 @@ GetDebugPrintErrorLevel (
 
 /**
   Sets the global debug print error level mask fpr the entire platform.
-
-  @retval  TRUE   The debug print error level mask was sucessfully set.
-  @retval  FALSE  The debug print error level mask could not be set.
+  
+  @param   ErrorLevel     Global debug print error level.
+  
+  @retval  TRUE           The debug print error level mask was sucessfully set.
+  @retval  FALSE          The debug print error level mask could not be set.
 
 **/
 BOOLEAN