diff --git a/Invaders/index.html b/Invaders/index.html
index 8b9a5ae..afb9b4f 100644
--- a/Invaders/index.html
+++ b/Invaders/index.html
@@ -11,7 +11,8 @@
 <body>
 <!-- partial:index.partial.html -->
 <p class="center">Space Invadors destroyed this page! Take revenge on them!
-  <br/> Use <span class="label label-danger">Space</span> to shoot and <span class="label label-danger">←</span>&#160;<span class="label label-danger">→</span> to move!&#160;&#160;&#160;<button class="btn btn-default btn-xs" id="restart">Restart</button></p>
+  <br/> Use <span class="label label-danger">Space</span> to shoot and <span class="label label-danger">←</span>&#160;<span class="label label-danger">→</span> to move!&#160;&#160;&#160;<button class="btn btn-default btn-xs" id="restart">Restart</button> or <button class="btn btn-default btn-xs" onclick="location.href='javascript:history.back()'" type="button">
+    Retreat</button></p>
 
 <canvas id="space-invaders"/>
 <!-- partial -->
