diff --git a/index.html b/index.html
index 0714689d..d4314b74 100644
--- a/index.html
+++ b/index.html
@@ -41,6 +41,17 @@
 
 <p>Having trouble with Pages? Check out our <a href="https://help.github.com/pages">documentation</a> or <a href="https://github.com/contact">contact support</a> and we’ll help you sort it out.</p>
 
+<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
+<!-- test -->
+<ins class="adsbygoogle"
+     style="display:block"
+     data-ad-client="ca-pub-9223557686918365"
+     data-ad-slot="4091024932"
+     data-ad-format="auto"></ins>
+<script>
+(adsbygoogle = window.adsbygoogle || []).push({});
+</script>
+
       <footer class="site-footer">
 
         <span class="site-footer-credits">This page was generated by <a href="https://pages.github.com">GitHub Pages</a> using the <a href="https://github.com/jasonlong/cayman-theme">Cayman theme</a> by <a href="https://twitter.com/jasonlong">Jason Long</a>.</span>