diff --git a/thunderbird/newTab.html b/thunderbird/newTab.html
index 2345b3f..540c6ea 100644
--- a/thunderbird/newTab.html
+++ b/thunderbird/newTab.html
@@ -183,6 +183,8 @@
     <div class='block' data-id='144'></div>
   </main>
   <script>
+    /** @see https://rectangles.app/ */
+
     const getCurrentBlockId = () => {
       const now = Date.now()
       const midnight = new Date(now).setHours(0, 0, 0, 0)