diff --git a/xos/gui/src/app/services/graph.extension.ts b/xos/gui/src/app/services/graph.extension.ts
index aa80755..56310f2 100644
--- a/xos/gui/src/app/services/graph.extension.ts
+++ b/xos/gui/src/app/services/graph.extension.ts
@@ -1,3 +1,21 @@
+
+/*
+ * Copyright 2017-present Open Networking Foundation
+
+ * 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 * as $ from 'jquery';
 import * as _ from 'lodash';