diff --git a/js/copyright.js b/js/copyright.ts
similarity index 88%
rename from js/copyright.js
rename to js/copyright.ts
index 5e8e36e..57ce95e 100644
--- a/js/copyright.js
+++ b/js/copyright.ts
@@ -1,5 +1,5 @@
 /*!
- * Copyright 2010-2018 Will Scullin <scullin@scullinsteel.com>
+ * Copyright 2010-2023 Will Scullin <scullin@scullinsteel.com>
  *
  * Permission to use, copy, modify, distribute, and sell this software and its
  * documentation for any purpose is hereby granted without fee, provided that