diff --git a/src/v2/guide/list.md b/src/v2/guide/list.md
index fd9931fb68..ef1af1fb43 100644
--- a/src/v2/guide/list.md
+++ b/src/v2/guide/list.md
@@ -298,7 +298,7 @@ new Vue({
     <li
       is="todo-item"
       v-for="(todo, index) in todos"
-      v-bind:key="todo"
+      v-bind:key="index"
       v-bind:title="todo"
       v-on:remove="todos.splice(index, 1)"
     ></li>