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-rw-r--r--lib/sqlalchemy/util/_py_collections.py9
1 files changed, 9 insertions, 0 deletions
diff --git a/lib/sqlalchemy/util/_py_collections.py b/lib/sqlalchemy/util/_py_collections.py
index 9bf5c3546..ee54180ac 100644
--- a/lib/sqlalchemy/util/_py_collections.py
+++ b/lib/sqlalchemy/util/_py_collections.py
@@ -1,3 +1,12 @@
+# util/_py_collections.py
+# Copyright (C) 2005-2022 the SQLAlchemy authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of SQLAlchemy and is released under
+# the MIT License: https://www.opensource.org/licenses/mit-license.php
+
+from __future__ import annotations
+
from itertools import filterfalse
from typing import AbstractSet
from typing import Any