diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index e71a4dd5e3..a25f380d02 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -1190,6 +1190,10 @@
   # @Prompt Delay access XHCI register after it issues HCRST (us)
   gEfiMdeModulePkgTokenSpaceGuid.PcdDelayXhciHCReset|2000|UINT16|0x30001060
 
+  ## Specifies the page count allocated for the MM communication buffer.
+  # @Prompt Defines the page allocation for the MM communication buffer; default is 128 pages (512KB).
+  gEfiMdeModulePkgTokenSpaceGuid.PcdMmCommBufferPages|128|UINT32|0x30001061
+
 [PcdsFixedAtBuild, PcdsPatchableInModule]
   ## Dynamic type PCD can be registered callback function for Pcd setting action.
   #  PcdMaxPeiPcdCallBackNumberPerPcdEntry indicates the maximum number of callback function