diff --git a/docs/zh/docs/thirdparty_migration/openstack-train-devstack.md b/docs/zh/docs/thirdparty_migration/openstack-train-devstack.md
index a192d294d900032fd7d779c679c3a91250158c17..87aee7097d10e841245e976b48ac0c7c3b5de4b2 100644
--- a/docs/zh/docs/thirdparty_migration/openstack-train-devstack.md
+++ b/docs/zh/docs/thirdparty_migration/openstack-train-devstack.md
@@ -161,7 +161,7 @@ DevStack 默认会安装 OpenStack 的核心服务，用户也可以修改配置
     # chmod +w /etc/sudoers
     # vi /etc/sudoers //在sudoers文件的“root ALL=(ALL) ALL”下面，加入如下内容:stack  ALL=(ALL) NOPASSWD: ALL
     # chmod -w /etc/sudoers
-    ```
+    # chmod 440/etc/sudoers 
     ![](./figures/createuser.png)
 
 ### 下载 devstack 脚本