diff --git a/libcst/_nodes/tests/test_simple_string.py b/libcst/_nodes/tests/test_simple_string.py
index ba2158924..d9abec501 100644
--- a/libcst/_nodes/tests/test_simple_string.py
+++ b/libcst/_nodes/tests/test_simple_string.py
@@ -1,3 +1,8 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
 import unittest
 
 import libcst as cst