diff --git a/docs/preprocessor.sh b/docs/preprocessor.sh
index 83323813ca..7f0026b036 100755
--- a/docs/preprocessor.sh
+++ b/docs/preprocessor.sh
@@ -1,4 +1,18 @@
 #!/usr/bin/env bash
+# Copyright 2022 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.
+
 set -euo pipefail
 
 cargo run -q --manifest-path ../Cargo.toml -- -q generate-config-schema -o ../target