diff --git a/src/soundUtils.ts b/src/soundUtils.ts
index ed12cfeb..162091b7 100644
--- a/src/soundUtils.ts
+++ b/src/soundUtils.ts
@@ -1,3 +1,10 @@
+/*
+Copyright 2024 New Vector Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only
+Please see LICENSE in the repository root for full details.
+*/
+
 import { logger } from "matrix-js-sdk/src/logger";
 
 type SoundDefinition = { mp3?: string; ogg: string };