diff --git a/install/centos.md b/install/centos.md
index 65a2bf0..cdf8831 100644
--- a/install/centos.md
+++ b/install/centos.md
@@ -43,8 +43,8 @@ $ sudo yum install -y yum-utils \
 $ sudo yum-config-manager \
     --add-repo \
     https://mirrors.ustc.edu.cn/docker-ce/linux/centos/docker-ce.repo
-$ sudo sed -i 's/download.docker.com/mirrors.ustc.edu.cn\/docker-ce/g' /etc/yum.repos.d/docker-ce.repo
 
+$ sudo sed -i 's/download.docker.com/mirrors.ustc.edu.cn\/docker-ce/g' /etc/yum.repos.d/docker-ce.repo
 
 # 官方源
 # $ sudo yum-config-manager \
diff --git a/install/fedora.md b/install/fedora.md
index fbc4d04..384dfd6 100644
--- a/install/fedora.md
+++ b/install/fedora.md
@@ -45,6 +45,7 @@ $ sudo dnf config-manager \
     --add-repo \
     https://mirrors.ustc.edu.cn/docker-ce/linux/fedora/docker-ce.repo
 
+$ sudo sed -i 's/download.docker.com/mirrors.ustc.edu.cn\/docker-ce/g' /etc/yum.repos.d/docker-ce.repo
 
 # 官方源
 # $ sudo dnf config-manager \