diff --git a/packages/vant/src/button/README.md b/packages/vant/src/button/README.md
index 20a4f234c..02f567f35 100644
--- a/packages/vant/src/button/README.md
+++ b/packages/vant/src/button/README.md
@@ -84,6 +84,7 @@ Use the `icon` prop to set the button icon. It supports all icons from the Icon
 <van-button icon="plus" type="primary" />
 <van-button icon="plus" type="primary">Button</van-button>
 <van-button
+  plain
   icon="https://fastly.jsdelivr.net/npm/@vant/assets/user-active.png"
   type="primary"
 >
diff --git a/packages/vant/src/button/README.zh-CN.md b/packages/vant/src/button/README.zh-CN.md
index 6cbde26b0..ed400b32d 100644
--- a/packages/vant/src/button/README.zh-CN.md
+++ b/packages/vant/src/button/README.zh-CN.md
@@ -84,6 +84,7 @@ app.use(Button);
 <van-button icon="plus" type="primary" />
 <van-button icon="plus" type="primary">按钮</van-button>
 <van-button
+  plain
   icon="https://fastly.jsdelivr.net/npm/@vant/assets/user-active.png"
   type="primary"
 >