diff --git a/examples/docs/en-US/tag.md b/examples/docs/en-US/tag.md
index bf91172c0..fb076d7ac 100644
--- a/examples/docs/en-US/tag.md
+++ b/examples/docs/en-US/tag.md
@@ -115,6 +115,7 @@ You can use the `close` event to add and remove tag dynamically.
 :::demo
 ```html
 <el-tag
+  :key="tag"
   v-for="tag in dynamicTags"
   :closable="true"
   :close-transition="false"
diff --git a/examples/docs/zh-CN/tag.md b/examples/docs/zh-CN/tag.md
index ad2343abe..5ab2e6a5c 100644
--- a/examples/docs/zh-CN/tag.md
+++ b/examples/docs/zh-CN/tag.md
@@ -115,6 +115,7 @@
 :::demo
 ```html
 <el-tag
+  :key="tag"
   v-for="tag in dynamicTags"
   :closable="true"
   :close-transition="false"