diff --git a/visual-git-guide.js b/visual-git-guide.js
index 1f07f64..13e856d 100644
--- a/visual-git-guide.js
+++ b/visual-git-guide.js
@@ -39,3 +39,13 @@ function replace_all_PNGs() {
     document.getElementById('link-to-png').style.display = 'block';
   }
 }
+
+// enable Google Analytics
+var _gaq = _gaq || [];
+_gaq.push(['_setAccount', 'UA-13167645-1']);
+_gaq.push(['_trackPageview']);
+(function() {
+  var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
+  ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
+  var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
+})();