diff --git a/src/guide/migration/key-attribute.md b/src/guide/migration/key-attribute.md
index a76bafbb..82fddddf 100644
--- a/src/guide/migration/key-attribute.md
+++ b/src/guide/migration/key-attribute.md
@@ -59,8 +59,8 @@ Vue 2.x では、`<template>` タグに `key` を含めることができませ
 ```html
 <!-- Vue 2.x -->
 <template v-for="item in list">
-  <div :key="item.id">...</div>
-  <span :key="item.id">...</span>
+  <div :key="'heading-' + item.id">...</div>
+  <span :key="'content-' + item.id">...</span>
 </template>
 ```