diff --git a/Python/Python-ast.c b/Python/Python-ast.c
index a02303d..46a1817 100644
--- a/Python/Python-ast.c
+++ b/Python/Python-ast.c
@@ -1,4 +1,13 @@
-/* File automatically generated by Parser/asdl_c.py */
+/* File automatically generated by Parser/asdl_c.py. */
+
+
+/*
+   __version__ 53731.
+
+   This module must be committed separately after each AST grammar change;
+   The __version__ number is set to the revision number of the commit
+   containing the grammar change.
+*/
 
 #include "Python.h"
 #include "Python-ast.h"