diff --git a/pylint_plugins/api_models.py b/pylint_plugins/api_models.py
index b4449158f5..a0d0e9669c 100644
--- a/pylint_plugins/api_models.py
+++ b/pylint_plugins/api_models.py
@@ -1,3 +1,18 @@
+# Licensed to the StackStorm, Inc ('StackStorm') under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+
 """
 Plugin which tells Pylint how to handle classes which define attributes using jsonschema
 in "schema" class attribute.