diff --git a/2-ui/1-document/12-multi-insert/article.md b/2-ui/1-document/12-multi-insert/article.md
index 197c85b1..8aef0c50 100644
--- a/2-ui/1-document/12-multi-insert/article.md
+++ b/2-ui/1-document/12-multi-insert/article.md
@@ -215,7 +215,7 @@ ul.appendChild(fragment); // вместо фрагмента вставятся
 
 <head>
   <meta charset="utf-8">
-  <script src="https://cdn.polyfill.io/v1/polyfill.js?features=Element.prototype.mutation"></script>
+  <script src="https://cdn.polyfill.io/v1/polyfill.js?features=Element.prototype.append"></script>
 </head>
 
 <body>
