diff --git a/src/index.html b/src/index.html
index 8c3b393..53e32b2 100644
--- a/src/index.html
+++ b/src/index.html
@@ -13,6 +13,7 @@
     <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.6/css/bootstrap-theme.min.css">
     <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.6/css/bootstrap.min.css">
     <link href="https://cdn.bootcss.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet">
+    <script src="https://cdn.polyfill.io/v2/polyfill.min.js"></script>
     <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/require.js/2.3.3/require.min.js" data-main="./scripts/main.js"></script>
 </head>