diff --git a/docs/vue-ebook/4.md b/docs/vue-ebook/4.md
index 2620ed2..e59d11d 100644
--- a/docs/vue-ebook/4.md
+++ b/docs/vue-ebook/4.md
@@ -381,7 +381,7 @@ Vue.component("my-component", {
 
 <my-button loading><a>test</a>按钮</my-button>
 <!-- 最终会变成这样 -->
-<button><i class="el-icon-loading"></i><span><a>test</a>按钮</span></button>
+<button class="my-button"><i class="el-icon-loading"></i><span><a>test</a>按钮</span></button>
 ```
 
 #### 默认内容