diff --git a/demos/two-videos.html b/demos/two-videos.html
index 57ceb2f..c8ccf96 100644
--- a/demos/two-videos.html
+++ b/demos/two-videos.html
@@ -10,11 +10,11 @@ video {
 </style>
 <title>Two videos in sync</title>
 <article>
-  <video id="one">
+  <video preload="auto" id="one">
     <source src="assets/dizzy.mp4" />
     <source src="assets/dizzy.ogv" />
   </video>    
-  <video id="two">
+  <video preload="auto" id="two">
     <source src="assets/dizzy.mp4" />
     <source src="assets/dizzy.ogv" />
   </video>