diff --git a/kokoro-linux.sh b/kokoro-linux.sh
old mode 100644
new mode 100755
index 90f41e6e..a427f4ad
--- a/kokoro-linux.sh
+++ b/kokoro-linux.sh
@@ -1,3 +1,18 @@
+#!/bin/sh
+# Copyright 2017 gRPC 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.
+
 # Install NVM
 curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.4/install.sh | bash