diff --git a/Assignment2.md b/Assignment2.md
index 3d50b5e..b18d0d0 100644
--- a/Assignment2.md
+++ b/Assignment2.md
@@ -77,7 +77,7 @@ $ yum install -y https://download.docker.com/linux/centos/7/x86_64/stable/Packag
 #### 按照提示将自己的用户加入docker的用户组(root 用户无需操作)
 
 ```bash
-$ sudo usermod -aG docker your-user
+$ sudo usermod -aG docker yourusername
 ```
 
 #### 基本的docker启动与查看状态命令如下