diff --git a/src/language-helper.js b/src/language-helper.js
index 78c487c..4964693 100644
--- a/src/language-helper.js
+++ b/src/language-helper.js
@@ -1,3 +1,19 @@
+/*
+Copyright 2021 New Vector Ltd
+
+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.
+*/
+
 const counterpart = require('counterpart');
 
 const DEFAULT_LOCALE = "en";