diff --git a/src/browser/renderer/shared/RendererUtils.test.ts b/src/browser/renderer/shared/RendererUtils.test.ts
index e933af52..b1e90bca 100644
--- a/src/browser/renderer/shared/RendererUtils.test.ts
+++ b/src/browser/renderer/shared/RendererUtils.test.ts
@@ -1,3 +1,8 @@
+/**
+ * Copyright (c) 2023 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
 import { computeVarinatOffset } from 'browser/renderer/shared/RendererUtils';
 import { assert } from 'chai';