diff --git a/netboot.sh b/netboot.sh
index c33a749..6f1a15e 100644
--- a/netboot.sh
+++ b/netboot.sh
@@ -1,5 +1,21 @@
 #!/bin/sh
 
+# Copyright 2018 Brent, Yang Bohan
+
+# 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 -ex
 
 while [ $# -gt 0 ]; do