diff --git a/docs/nixos-with-flakes/other-useful-tips.md b/docs/nixos-with-flakes/other-useful-tips.md
index 3b39651..94568e0 100644
--- a/docs/nixos-with-flakes/other-useful-tips.md
+++ b/docs/nixos-with-flakes/other-useful-tips.md
@@ -86,8 +86,12 @@ To clean up historical versions and free up storage space, use the following com
 # Delete all historical versions older than 7 days
 sudo nix profile wipe-history --older-than 7d --profile /nix/var/nix/profiles/system
 
-# Run garbage collection after wiping history
+# Wiping history won't garbage collect the unused packages, you need to run the gc command manually as root:
 sudo nix-collect-garbage --delete-old
+
+# Due to the following issue, you need to run the gc command as per user to delete home-manager's historical data:
+# https://github.com/NixOS/nix/issues/8508
+nix-collect-garbage --delete-old
 ```
 
 ## Why some packages are installed?
diff --git a/docs/zh/nixos-with-flakes/other-useful-tips.md b/docs/zh/nixos-with-flakes/other-useful-tips.md
index e2b4fb6..e3f9e2b 100644
--- a/docs/zh/nixos-with-flakes/other-useful-tips.md
+++ b/docs/zh/nixos-with-flakes/other-useful-tips.md
@@ -78,8 +78,12 @@ nix profile history --profile /nix/var/nix/profiles/system
 ```shell
 # 清理 7 天之前的所有历史版本
 sudo nix profile wipe-history --older-than 7d --profile /nix/var/nix/profiles/system
-# 清理历史版本并不会删除数据，还需要手动 gc 下
+# 清理历史版本并不会删除数据，还需要以 root 身份运行 gc 命令来删除所有未使用的包
 sudo nix-collect-garbage --delete-old
+
+# 因为如下 issue，还需要以当前用户身份运行 gc 命令来删除 home-manager 的历史版本和包
+# https://github.com/NixOS/nix/issues/8508
+nix-collect-garbage --delete-old
 ```
 
 ## 查询为什么某个包被安装了 {#why-some-packages-are-installed}