diff --git a/src/module/utils.ts b/src/module/utils.ts
index 7c9c184..5081ba2 100644
--- a/src/module/utils.ts
+++ b/src/module/utils.ts
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2021 Johannes Loher
+//
+// SPDX-License-Identifier: MIT
+
 import { getGame } from "./helpers";
 
 export function enforce(value: unknown, message?: string | Error): asserts value {