diff --git a/docs/en/nixos-with-flakes/update-the-system.md b/docs/en/nixos-with-flakes/update-the-system.md
index 14f1f69..7fecfa4 100644
--- a/docs/en/nixos-with-flakes/update-the-system.md
+++ b/docs/en/nixos-with-flakes/update-the-system.md
@@ -3,6 +3,10 @@
 With Flakes, updating the system is straightforward. Simply execute the following commands
 in `/etc/nixos` or any other location where you keep the configuration:
 
+> **NOTE**: The `/etc/nixos` directory is owned by and only writable to `root`. Therefore,
+> if your flake is located in this directory, you'll need to use `sudo` to update any
+> configuration files.
+
 ```shell
 # Update flake.lock
 nix flake update
@@ -11,10 +15,12 @@ nix flake update
 nix flake update home-manager
 
 # Apply the updates
-sudo nixos-rebuild switch --flake .
+sudo nixos-rebuild switch
+# Or if your flake is not located at /etc/nixos
+sudo nixos-rebuild switch --flake /path/to/flake
 
-# Or to update flake.lock & apply with one command (i.e. same as running "nix flake update" before 'switch')
-sudo nixos-rebuild switch --flake .
+# Or to update flake.lock & apply with one command (i.e. same as running "nix flake update" before)
+sudo nixos-rebuild switch --recreate-lock-file
 ```
 
 Occasionally, you may encounter a "sha256 mismatch" error when running
diff --git a/docs/zh/nixos-with-flakes/update-the-system.md b/docs/zh/nixos-with-flakes/update-the-system.md
index b23ce33..ff31931 100644
--- a/docs/zh/nixos-with-flakes/update-the-system.md
+++ b/docs/zh/nixos-with-flakes/update-the-system.md
@@ -11,7 +11,13 @@ nix flake update
 nix flake update home-manager
 
 # 部署系统
-sudo nixos-rebuild switch --flake .
+sudo nixos-rebuild switch
+# 如果你的 flake 不在 /etc/nixos 中，则需要额外使用 --flake 参数指定
+sudo nixos-rebuild switch --flake /path/to/flake
+
+
+# 也可以一行命令同时实现 nix flake update 与系统部署
+sudo nixos-rebuild switch --recreate-lock-file
 ```
 
 另外有时候安装新的包，跑 `sudo nixos-rebuild switch` 时可能会遇到 sha256 不匹配的报错，也