Say it with me now: punct-u-ation. Yes, very good!

index.html

@@ -39,7 +39,7 @@ <h2>Sample code for the book</h2>
 
 <h2>Contact</h2>
 
-<p>If you've got thoughts or questions, hit us up here or on Twitter at <a href="http://twitter.com/aparrish">@aparrish</a>, <a href="http://twitter.com/brendn">@brendn</a>, and <a href="http://twitter.com/mike_dory">@mike_dory</a>, or open a pull request here</p>
+<p>If you've got thoughts or questions, hit us up here or on Twitter at <a href="http://twitter.com/aparrish">@aparrish</a>, <a href="http://twitter.com/brendn">@brendn</a>, and <a href="http://twitter.com/mike_dory">@mike_dory</a>, or open a pull request here.</p>
       </section>
       <footer>
         <p>This project is maintained by <a href="https://github.com/Introduction-to-Tornado">Introduction-to-Tornado</a></p>