diff --git a/sql/gen-sql-api-docs.py b/sql/gen-sql-api-docs.py
index 61328997c1c58..72518504847db 100644
--- a/sql/gen-sql-api-docs.py
+++ b/sql/gen-sql-api-docs.py
@@ -195,6 +195,7 @@ def generate_sql_api_markdown(jvm, path):
     """
 
     with open(path, 'w') as mdfile:
+        mdfile.write("# Built-in Finctions\n\n")
         for info in _list_function_infos(jvm):
             name = info.name
             usage = _make_pretty_usage(info.usage)