1 files changed, 2 insertions, 0 deletions
diff --git a/MdeModulePkg/Include/Library/IfrSupportLib.h b/MdeModulePkg/Include/Library/IfrSupportLib.h
index 1608d14ab1..e7e04ba992 100644
--- a/MdeModulePkg/Include/Library/IfrSupportLib.h
+++ b/MdeModulePkg/Include/Library/IfrSupportLib.h
@@ -852,6 +852,8 @@ BufToHexString (
   If String has N valid hexadecimal characters for conversion,  the caller must make sure Buffer is at least 
   N/2 (if N is even) or (N+1)/2 (if N if odd) bytes. 
 
+  If either Buffer, BufferSizeInBytes or String is NULL, then ASSERT ().
+
   @param Buffer                      The output buffer allocated by the caller.
   @param BufferSizeInBytes           On input, the size in bytes of Buffer. On output, it is updated to 
                                      contain the size of the Buffer which is actually used for the converstion.