diff --git a/test/harness/mjolnirSetup.ts b/test/harness/mjolnirSetup.ts
index c697c33c..9c76f79c 100644
--- a/test/harness/mjolnirSetup.ts
+++ b/test/harness/mjolnirSetup.ts
@@ -1,3 +1,18 @@
+/*
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+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 {
     MatrixClient,
     Permalinks,