diff --git a/demo/www/index.html b/demo/www/index.html
index 3ef797c..0f08b4d 100644
--- a/demo/www/index.html
+++ b/demo/www/index.html
@@ -45,6 +45,8 @@
           <input class="form-control mr-sm-2" id="seed" type="search" placeholder="Seed" aria-label="Seed">
         </ul>
       </div>
+      <a class="github-button" href="https://github.com/klangner/mapgen.rs" data-icon="octicon-star"
+        aria-label="Star ntkme/github-buttons on GitHub">Star</a>
     </nav>
 
     <canvas id="mapgen-canvas"></canvas>
@@ -56,5 +58,6 @@
       integrity="sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN" crossorigin="anonymous"></script>
     <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"
       integrity="sha384-B4gt1jrGC7Jh4AgTPSdUtOBvfO8shuf57BaghqFfPlYxofvL8/KUEfYiJOMMV+rV" crossorigin="anonymous"></script>
+    <script async defer src="https://buttons.github.io/buttons.js"></script>
   </body>
 </html>