diff --git a/docs/zh/introduction/installation.md b/docs/zh/introduction/installation.md
index ad032ba..43cc513 100644
--- a/docs/zh/introduction/installation.md
+++ b/docs/zh/introduction/installation.md
@@ -11,5 +11,5 @@ NixOS 的安装步骤很简单，这里不多介绍，仅列一下我觉得比
 
 1. [NixOS 官网](https://nixos.org/download.html)
 2. 国内镜像源：
-  1. <https://mirrors.ustc.edu.cn/help/nix-channels.html>
-  2. <https://mirrors.tuna.tsinghua.edu.cn/help/nix/> 
+    1. <https://mirrors.ustc.edu.cn/help/nix-channels.html>
+    2. <https://mirrors.tuna.tsinghua.edu.cn/help/nix/>