diff --git a/help/_posts/2019-03-18-arch4edu.md b/help/_posts/2019-03-18-arch4edu.md
index 4b367cc..aa3ed45 100644
--- a/help/_posts/2019-03-18-arch4edu.md
+++ b/help/_posts/2019-03-18-arch4edu.md
@@ -18,9 +18,9 @@ Arch4edu 是面向高校用户推出的非官方软件仓库，
 * 导入 GPG key
 
 ```
-$ pacman-key --recv-keys 7931B6D628C8D3BA
-$ pacman-key --finger 7931B6D628C8D3BA
-$ pacman-key --lsign-key 7931B6D628C8D3BA
+# pacman-key --recv-keys 7931B6D628C8D3BA
+# pacman-key --finger 7931B6D628C8D3BA
+# pacman-key --lsign-key 7931B6D628C8D3BA
 ```
 
 * 在 `/etc/pacman.conf` 文件末尾添加以下内容：