diff --git a/docs/lab/js/webtorrent.js b/docs/lab/js/webtorrent.js
index 57f646149..2fbacd5a9 100644
--- a/docs/lab/js/webtorrent.js
+++ b/docs/lab/js/webtorrent.js
@@ -3,8 +3,9 @@ var art = new Artplayer({
     url: 'magnet:?xt=urn:btih:6a9759bffd5c0af65319979fb7832189f4f3c35d&dn=sintel.mp4&tr=wss%3A%2F%2Ftracker.btorrent.xyz&tr=wss%3A%2F%2Ftracker.fastcast.nz&tr=wss%3A%2F%2Ftracker.openwebtorrent.com&tr=wss%3A%2F%2Ftracker.webtorrent.io&ws=https%3A%2F%2Fwebtorrent.io%2Ftorrents%2Fsintel-1024-surround.mp4',
     type: 'torrent',
     customType: {
-        torrent: function (video, url) {
+        torrent: function (video, url, art) {
             var client = new WebTorrent();
+            art.loading.show();
             client.add(url, function (torrent) {
                 var file = torrent.files[0];
                 file.renderTo(video, {