diff --git a/docs/tutorial/migration-to-vue3.md b/docs/tutorial/migration-to-vue3.md
index 1caa49c061d75ccc72e131bd8d4dabb03e27e30f..47192a6c0b98f44aa9d9fb9c0a93f40987622205 100644
--- a/docs/tutorial/migration-to-vue3.md
+++ b/docs/tutorial/migration-to-vue3.md
@@ -27,6 +27,7 @@ app.$mount()
 ```JS
 import App from './App'
 import { createSSRApp } from 'vue'
+// 不能修改导出的 createApp 方法名，不能修改从 Vue 中导入的 createSSRApp。
 export function createApp() {
   const app = createSSRApp(App)
   return {