diff --git a/spec/layout/demo/top-aside.md b/spec/layout/demo/top-aside.md
index be8ef3e60d..8b88227f58 100644
--- a/spec/layout/demo/top-aside.md
+++ b/spec/layout/demo/top-aside.md
@@ -129,7 +129,7 @@ ReactDOM.render(
 .ant-layout-topaside .ant-layout-content {
   border-left: 1px solid #e9e9e9;
   padding: 0 24px;
-  overflow: hidden;
+  overflow: auto;
   position: relative;
   left: -1px;
 }