diff --git a/notes/index.html b/notes/index.html
index d7faec9..a9860ec 100644
--- a/notes/index.html
+++ b/notes/index.html
@@ -16,7 +16,7 @@
     <!--
     https://auth0.com/blog/introduction-to-progressive-apps-part-one/
     https://github.com/unicodeveloper/pwa-commits
-
+    http://bl.ocks.org/jfsiii/5380802
     -->
 
     <style>