diff --git a/ts/lib/sveltelib/undo-manager.ts b/ts/lib/sveltelib/undo-manager.ts
index f6d46f381..cf3ee1ed7 100644
--- a/ts/lib/sveltelib/undo-manager.ts
+++ b/ts/lib/sveltelib/undo-manager.ts
@@ -1,3 +1,6 @@
+// Copyright: Ankitects Pty Ltd and contributors
+// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
+
 import { getRange, getSelection } from "@tslib/cross-browser";
 import { getMaxOffset } from "./input-handler";