diff --git a/practice/master-installation.md b/practice/master-installation.md
index b4a0fe175..b711e1dcb 100644
--- a/practice/master-installation.md
+++ b/practice/master-installation.md
@@ -183,6 +183,7 @@ systemctl status kube-apiserver
 文件路径`/usr/lib/systemd/system/kube-controller-manager.service`
 
 ```ini
+[Unit]
 Description=Kubernetes Controller Manager
 Documentation=https://github.com/GoogleCloudPlatform/kubernetes