diff --git a/tests/test_documents.py b/tests/test_documents.py
index 8974cb33..9db1bb65 100644
--- a/tests/test_documents.py
+++ b/tests/test_documents.py
@@ -1,3 +1,6 @@
+# Copyright (c) Jupyter Development Team.
+# Distributed under the terms of the Modified BSD License.
+
 import sys
 
 if sys.version_info < (3, 10):