diff --git a/docs/best-practices/simplify-nixos-related-commands.md b/docs/best-practices/simplify-nixos-related-commands.md
index 3b64d7b..1b7a990 100644
--- a/docs/best-practices/simplify-nixos-related-commands.md
+++ b/docs/best-practices/simplify-nixos-related-commands.md
@@ -23,18 +23,28 @@ deploy:
 debug:
   nixos-rebuild switch --flake . --use-remote-sudo --show-trace --verbose
 
-update:
+up:
   nix flake update
 
+# Update specific input
+# usage: make upp i=home-manager
+upp:
+  nix flake lock --update-input $(i)
+
 history:
   nix profile history --profile /nix/var/nix/profiles/system
 
-gc:
+repl:
+  nix repl -f flake:nixpkgs
+
+clean:
   # remove all generations older than 7 days
   sudo nix profile wipe-history --profile /nix/var/nix/profiles/system  --older-than 7d
 
+gc:
   # garbage collect all unused nix store entries
   sudo nix store gc --debug
+  sudo nix-collect-garbage --delete-old
 
 ############################################################################
 #
diff --git a/docs/nixos-with-flakes/update-the-system.md b/docs/nixos-with-flakes/update-the-system.md
index 1510697..722fc16 100644
--- a/docs/nixos-with-flakes/update-the-system.md
+++ b/docs/nixos-with-flakes/update-the-system.md
@@ -6,8 +6,11 @@ With Flakes, updating the system is straightforward. Simply execute the followin
 # Update flake.lock
 nix flake update
 
+# Or replace only the specific input, such as home-manager:
+nix flake lock --update-input home-manager
+
 # Apply the updates
 sudo nixos-rebuild switch --flake .
 ```
 
-Occasionally, you may encounter a "sha256 mismatch" error when running `nixos-rebuild switch`. This error can be resolved by updating `flake.lock` using `nix flake update`.
\ No newline at end of file
+Occasionally, you may encounter a "sha256 mismatch" error when running `nixos-rebuild switch`. This error can be resolved by updating `flake.lock` using `nix flake update`.
diff --git a/docs/zh/best-practices/simplify-nixos-related-commands.md b/docs/zh/best-practices/simplify-nixos-related-commands.md
index c06d624..f965005 100644
--- a/docs/zh/best-practices/simplify-nixos-related-commands.md
+++ b/docs/zh/best-practices/simplify-nixos-related-commands.md
@@ -24,18 +24,28 @@ deploy:
 debug:
   nixos-rebuild switch --flake . --use-remote-sudo --show-trace --verbose
 
-update:
+up:
   nix flake update
 
+# Update specific input
+# usage: make upp i=home-manager
+upp:
+  nix flake lock --update-input $(i)
+
 history:
   nix profile history --profile /nix/var/nix/profiles/system
 
-gc:
+repl:
+  nix repl -f flake:nixpkgs
+
+clean:
   # remove all generations older than 7 days
   sudo nix profile wipe-history --profile /nix/var/nix/profiles/system  --older-than 7d
 
+gc:
   # garbage collect all unused nix store entries
   sudo nix store gc --debug
+  sudo nix-collect-garbage --delete-old
 
 ############################################################################
 #
diff --git a/docs/zh/nixos-with-flakes/update-the-system.md b/docs/zh/nixos-with-flakes/update-the-system.md
index 2f17186..a5cedd7 100644
--- a/docs/zh/nixos-with-flakes/update-the-system.md
+++ b/docs/zh/nixos-with-flakes/update-the-system.md
@@ -3,8 +3,12 @@
 在使用了 Nix Flakes 后，要更新系统也很简单，先更新 flake.lock 文件，然后部署即可。在配置文件夹中执行如下命令：
 
 ```shell
-# 更新 flake.lock
+# 更新 flake.lock（更新所有依赖项）
 nix flake update
+
+# 或者也可以只更新特定的依赖项，比如只更新 home-manager:
+nix flake lock --update-input home-manager
+
 # 部署系统
 sudo nixos-rebuild switch --flake .
 ```