diff --git a/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c b/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
index 56b776d3d8..8ccddf8e9f 100644
--- a/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
+++ b/UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
@@ -822,7 +822,7 @@ MpInitLibEnableDisableAP (
   This funtion will try to invoke platform specific microcode shadow logic to
   relocate microcode update patches into memory.
 
-  @param[in] CpuMpData  The pointer to CPU MP Data structure.
+  @param[in, out] CpuMpData  The pointer to CPU MP Data structure.
 
   @retval EFI_SUCCESS              Shadow microcode success.
   @retval EFI_OUT_OF_RESOURCES     No enough resource to complete the operation.
diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.h b/UefiCpuPkg/Library/MpInitLib/MpLib.h
index 0c89f8a6e7..74e919dae0 100755
--- a/UefiCpuPkg/Library/MpInitLib/MpLib.h
+++ b/UefiCpuPkg/Library/MpInitLib/MpLib.h
@@ -661,7 +661,7 @@ GetProcessorNumber (
   This funtion will try to invoke platform specific microcode shadow logic to
   relocate microcode update patches into memory.
 
-  @param[in] CpuMpData  The pointer to CPU MP Data structure.
+  @param[in, out] CpuMpData  The pointer to CPU MP Data structure.
 
   @retval EFI_SUCCESS              Shadow microcode success.
   @retval EFI_OUT_OF_RESOURCES     No enough resource to complete the operation.
diff --git a/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c b/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
index 17b60903c5..a548fed23f 100644
--- a/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
+++ b/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
@@ -644,7 +644,7 @@ MpInitLibEnableDisableAP (
   This funtion will try to invoke platform specific microcode shadow logic to
   relocate microcode update patches into memory.
 
-  @param[in] CpuMpData  The pointer to CPU MP Data structure.
+  @param[in, out] CpuMpData  The pointer to CPU MP Data structure.
 
   @retval EFI_SUCCESS              Shadow microcode success.
   @retval EFI_OUT_OF_RESOURCES     No enough resource to complete the operation.