diff --git a/cases/supervisor.md b/cases/supervisor.md
index c197be4..91dfb85 100644
--- a/cases/supervisor.md
+++ b/cases/supervisor.md
@@ -13,8 +13,7 @@ RUN apt-get update
 RUN apt-get upgrade -y
 ```
 
-### 安装 supervisor
-安装 ssh、apache 和 supervisor。
+### 安装 ssh、apache 和 supervisor
 ```
 RUN apt-get install -y openssh-server apache2 supervisor
 RUN mkdir -p /var/run/sshd