diff --git a/readme.md b/readme.md
index 51aad352..db099b58 100644
--- a/readme.md
+++ b/readme.md
@@ -435,10 +435,12 @@ player.source = {
         {
             src: '/path/to/movie.mp4',
             type: 'video/mp4',
+            size: 720,
         },
         {
             src: '/path/to/movie.webm',
             type: 'video/webm',
+            size: 1080,
         },
     ],
     poster: '/path/to/poster.jpg',