diff --git a/ncsid/test/normalize_mac_test.sh b/ncsid/test/normalize_mac_test.sh
index 4c94570..734d4a5 100755
--- a/ncsid/test/normalize_mac_test.sh
+++ b/ncsid/test/normalize_mac_test.sh
@@ -1,4 +1,18 @@
 #!/bin/bash
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 TEST_DIR="$(dirname "${BASH_SOURCE[0]}")"
 source "$TEST_DIR"/test_lib.sh