diff --git a/docs/guide/tutorial.md b/docs/guide/tutorial.md
index 34fef5d..8574260 100644
--- a/docs/guide/tutorial.md
+++ b/docs/guide/tutorial.md
@@ -112,6 +112,7 @@ Take the `react 16` project generated by `create react app` as an example, with
      ReactDOM.unmountComponentAtNode(container ? container.querySelector('#root') : document.querySelector('#root'));
    }
    ```
+It's important, When mount a sub-application through ReactDOM.render, need to ensure each sub-application load with a new router instance.
 
 4. Modify `webpack` configuration
 
diff --git a/docs/guide/tutorial.zh.md b/docs/guide/tutorial.zh.md
index c769401..6bfa522 100644
--- a/docs/guide/tutorial.zh.md
+++ b/docs/guide/tutorial.zh.md
@@ -112,6 +112,7 @@ start();
      ReactDOM.unmountComponentAtNode(container ? container.querySelector('#root') : document.querySelector('#root'));
    }
    ```
+这里需要特别注意的是，通过 ReactDOM.render 挂载子应用时，需要保证每次子应用加载都应使用一个新的路由实例。
 
 4. 修改 `webpack` 配置