diff --git a/hack/build.sh b/hack/build.sh
index a834f8a5d..b27170627 100755
--- a/hack/build.sh
+++ b/hack/build.sh
@@ -1,4 +1,18 @@
-#!/bin/bash
+#!/usr/bin/env bash
+
+# Copyright 2018 The Knative Authors
+#
+# 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 -e
 set -x
diff --git a/hack/macros.py b/hack/macros.py
index 05d1e3098..da3601c32 100644
--- a/hack/macros.py
+++ b/hack/macros.py
@@ -1,3 +1,17 @@
+# Copyright 2021 The Knative Authors
+#
+# 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.
+
 import os
 import semver
 import sys
diff --git a/hack/mkdocs.sh b/hack/mkdocs.sh
index eca654d35..ecabff3e5 100755
--- a/hack/mkdocs.sh
+++ b/hack/mkdocs.sh
@@ -1,5 +1,19 @@
 #!/bin/sh
 
+# Copyright 2021 The Knative Authors
+#
+# 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.
+
 PORT=${2:-8000}
 
 mkdocs serve --config-file "./mkdocs.yml" --livereload -a 0.0.0.0:${PORT}