diff --git a/modules/base/nix.nix b/modules/base/nix.nix
index cdd58f01..82f32f0f 100644
--- a/modules/base/nix.nix
+++ b/modules/base/nix.nix
@@ -39,8 +39,4 @@
     ];
     builders-use-substitutes = true;
   };
-
-  nix.extraOptions = ''
-    !include ${config.age.secrets.nix-access-tokens.path}
-  '';
 }
diff --git a/modules/darwin/nix-core.nix b/modules/darwin/nix-core.nix
index 0b12ea73..419ccaed 100644
--- a/modules/darwin/nix-core.nix
+++ b/modules/darwin/nix-core.nix
@@ -1,4 +1,4 @@
-{
+{config, ...}: {
   ###################################################################################
   #
   #  Core configuration for nix-darwin
@@ -24,4 +24,8 @@
   nix.gc.automatic = false;
 
   system.stateVersion = 5;
+
+  nix.extraOptions = ''
+    !include ${config.age.secrets.nix-access-tokens.path}
+  '';
 }
diff --git a/modules/nixos/base/nix.nix b/modules/nixos/base/nix.nix
index 12f5dad0..5e7c28e3 100644
--- a/modules/nixos/base/nix.nix
+++ b/modules/nixos/base/nix.nix
@@ -1,6 +1,6 @@
 {
+  config,
   lib,
-  nixpkgs,
   ...
 }: {
   # to install chrome, you need to enable unfree packages
@@ -18,4 +18,8 @@
   nix.settings.auto-optimise-store = true;
 
   nix.channel.enable = false; # remove nix-channel related tools & configs, we use flakes instead.
+
+  nix.extraOptions = ''
+    !include ${config.age.secrets.nix-access-tokens.path}
+  '';
 }
diff --git a/nixos-installer/README.md b/nixos-installer/README.md
index 62f35647..8a41a00a 100644
--- a/nixos-installer/README.md
+++ b/nixos-installer/README.md
@@ -179,8 +179,8 @@ Filename				Type		Size		Used		Priority
 Clone this repository:
 
 ```bash
-# enter an shell with git/vim/ssh-agent/gnumake available
-nix-shell -p git vim gnumake
+# enter an shell with git/vim/ssh-agent available
+nix-shell -p git vim just
 
 # clone this repository
 git clone https://github.com/ryan4yin/nix-config.git
@@ -211,7 +211,7 @@ nixos-install --root /mnt --flake .#ai --no-root-password --show-trace --verbose
 
 # if you want to use a cache mirror, run this command instead
 # replace the mirror url with your own
-nixos-install --root /mnt --flake .#ai --no-root-password --show-trace --verbose --option substituters "https://mirror.sjtu.edu.cn/nix-channels/store"  # install-2
+nixos-install --root /mnt --flake .#shoukei --no-root-password --show-trace --verbose --option substituters "https://mirrors.ustc.edu.cn/nix-channels/store  https://cache.nixos.org/" # install-2
 
 # enter into the installed system, check password & users
 # `su ryan` => `sudo -i` => enter ryan's password => successfully login
diff --git a/nixos-installer/README.shoukei.md b/nixos-installer/README.shoukei.md
index 60f1a22f..d1cd8200 100755
--- a/nixos-installer/README.shoukei.md
+++ b/nixos-installer/README.shoukei.md
@@ -254,7 +254,7 @@ nixos-install --root /mnt --flake .#shoukei --no-root-password --show-trace --ve
 
 # if you want to use a cache mirror, run this command instead
 # replace the mirror url with your own
-nixos-install --root /mnt --flake .#shoukei --no-root-password --show-trace --verbose --option substituters "https://mirrors.ustc.edu.cn/nix-channels/store" # install-2
+nixos-install --root /mnt --flake .#shoukei --no-root-password --show-trace --verbose --option substituters "https://mirrors.ustc.edu.cn/nix-channels/store  https://cache.nixos.org/" # install-2
 
 # enter into the installed system, check password & users
 # `su ryan` => `sudo -i` => enter ryan's password => successfully login