Add description for NULL return value.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6189 6f19259b-4bc3-4df7-8a09-765794883524

diff --git a/MdePkg/Library/DxePcdLib/DxePcdLib.c b/MdePkg/Library/DxePcdLib/DxePcdLib.c
index b2e09af56555b0fbda4adefa6901d20786009393..26e05edaf51aa9b1167b62e87a2df4887de7ce77 100644 (file)
--- a/MdePkg/Library/DxePcdLib/DxePcdLib.c
+++ b/MdePkg/Library/DxePcdLib/DxePcdLib.c
@@ -956,7 +956,8 @@ LibPcdGetNextTokenSpace (
   @param[in] Buffer             A pointer to the buffer to used to set the target variable.\r
 \r
   @return Return the pinter to the buffer been set.\r
-\r
+  @retval NULL   If SizeOfBuffer is set to MAX_ADDRESS, then SizeOfBuffer must be set \r
+                 to MaximumDatumSize and NULL must be returned.\r
 **/\r
 VOID *\r
 EFIAPI\r