diff --git a/Lib/ast.py b/Lib/ast.py
index 507fec5f2d3890..9885f0ff67bb53 100644
--- a/Lib/ast.py
+++ b/Lib/ast.py
@@ -1,6 +1,6 @@
 """
     ast
-    ~~~
+    ---
 
     The `ast` module helps Python applications to process trees of the Python
     abstract syntax grammar.  The abstract syntax itself might change with