diff --git a/docs/vue.md b/docs/vue.md
index af35bd1ee..bff9cf7ad 100644
--- a/docs/vue.md
+++ b/docs/vue.md
@@ -42,7 +42,7 @@ You can manually initialize a Vue instance.
 ```markdown
 # Vue demo
 
-<div>hello {{ msg }}</div>
+<div id="main">hello {{ msg }}</div>
 
 <script>
   new Vue({