diff --git a/_layouts/defaults.html b/_layouts/defaults.html
index 91eb655..377b111 100644
--- a/_layouts/defaults.html
+++ b/_layouts/defaults.html
@@ -30,6 +30,7 @@
     <link rel="stylesheet" href="{{ '/assets/css/style.css?v=' | append: site.github.build_revision | relative_url }}">
   </head>
   <body>
+    <script type="text/javascript" src="//cdn.plu.mx/widget-summary.js"></script>
     <a id="skip-to-content" href="#content">Skip to the content.</a>
 
     <header class="page-header" role="banner">
