diff --git a/configuration.nix b/configuration.nix
index 4d93b06..bcf98f0 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -200,23 +200,3 @@
   # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
   system.stateVersion = "22.05"; # Did you read the comment?
 
-
-##### nix extra options #######
-
-  nix = {
-    extraOptions = ''
-      experimental-features = nix-command flakes	
-      keep-outputs = true
-      keep-derivations = true
-    '';
-#    package = pkgs.nixFlakes;
-    gc = {
-      automatic = true;
-      dates = "weekly";
-      options = "--delete-older-than 7d";
-      persistent = true;
-    };
-    autoOptimiseStore = true;
-  };
-
-}
diff --git a/extra-nixos.nix b/extra-nixos.nix
new file mode 100644
index 0000000..eb08e10
--- /dev/null
+++ b/extra-nixos.nix
@@ -0,0 +1,23 @@
+{ config, pkgs, ... }:
+{
+
+##### nix extra options #######
+
+  nix = {
+    extraOptions = ''
+      experimental-features = nix-command flakes	
+      keep-outputs = true
+      keep-derivations = true
+    '';
+#    package = pkgs.nixFlakes;
+    gc = {
+      automatic = true;
+      dates = "weekly";
+      options = "--delete-older-than 7d";
+      persistent = true;
+    };
+    settings.auto-optimize-store = true;
+  };
+}
+
+}
\ No newline at end of file