diff --git a/docker/Dockerfile.logstash b/docker/Dockerfile.logstash
index a90ecb0..861b3c0 100644
--- a/docker/Dockerfile.logstash
+++ b/docker/Dockerfile.logstash
@@ -1,3 +1,17 @@
+# Copyright 2018 the original author or 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.
+
 # Build from latest stable load
 FROM docker.elastic.co/logstash/logstash:5.6.0