diff --git a/source/_posts/Linux/pacman.md b/source/_posts/Linux/pacman.md
index c91dcf9..9f39a2f 100644
--- a/source/_posts/Linux/pacman.md
+++ b/source/_posts/Linux/pacman.md
@@ -13,3 +13,22 @@ date: 2022-08-31 14:08:30
 ``` bash 使用 rankmirrors 将 mirrorlist 中的 mirrors 进行排序
 rankmirrors /etc/pacman.d/mirrorlist.china > /etc/pacman.d/mirrorlist
 ```
+
+# 自动清理老旧的包缓存
+
+建立一个 hook 文件在 `/etc/pacman.d/hooks/clean_package_cache.hook`，内容如下：
+
+``` conf
+[Trigger]
+Operation = Upgrade
+Operation = Install
+Operation = Remove
+Type = Package
+Target = *
+[Action]
+Description = Cleaning pacman cache...
+When = PostTransaction
+Exec = /usr/bin/paccache -rk3
+```
+
+系统会在每次安装升级卸载以后执行 `/usr/bin/paccache -rk3` 删除包的历史缓存，仅保留最近的3个版本。