diff --git a/flake.nix b/flake.nix
index 95eafd3..4e63a96 100644
--- a/flake.nix
+++ b/flake.nix
@@ -119,7 +119,6 @@
           config.allowUnfree = true;
           config.permittedInsecurePackages = [
             "python-2.7.18.6"
-            # "openssl-1.1.1u"
           ];
 
           overlays = [
@@ -141,7 +140,6 @@
               landingpage = landingpage.packages.${system}.plain;
               trilium-server = nixpkgs-unstable.legacyPackages.${system}.trilium-server;
               kmonad = kmonad.packages.${system}.kmonad;
-              #deploy-rs = deploy-rs.packages.${system}.deploy-rs;
             })
             (import ./nixos/pkgs)
           ];
@@ -153,6 +151,7 @@
       };
 
       # todo : why redefine it?
+      # Mic92 means, is not needed anymore
       nixosSystem = args:
         (lib.makeOverridable lib.nixosSystem)
           (lib.recursiveUpdate args {
diff --git a/nixos/components/default.nix b/nixos/components/default.nix
index 1f86233..8c75e65 100644
--- a/nixos/components/default.nix
+++ b/nixos/components/default.nix
@@ -5,5 +5,6 @@
     ./media
     ./network
     ./terminal
+    ./nixos
   ];
 }
diff --git a/nixos/components/nixos/default.nix b/nixos/components/nixos/default.nix
new file mode 100644
index 0000000..81341c6
--- /dev/null
+++ b/nixos/components/nixos/default.nix
@@ -0,0 +1,12 @@
+{ config, lib, ... }:
+{
+  imports = [ ./upgrade-diff.nix ];
+
+  options.components.nixos.enable = lib.mkOption {
+    type = lib.types.bool;
+    default = true;
+  };
+
+  config = lib.mkIf (config.components.nixos.enable) { };
+
+}
diff --git a/nixos/components/nixos/upgrade-diff.nix b/nixos/components/nixos/upgrade-diff.nix
new file mode 100644
index 0000000..e28e53a
--- /dev/null
+++ b/nixos/components/nixos/upgrade-diff.nix
@@ -0,0 +1,22 @@
+# MIT Jörg Thalheim - https://github.com/Mic92/dotfiles/blob/c6cad4e57016945c4816c8ec6f0a94daaa0c3203/nixos/modules/upgrade-diff.nix
+{ config, lib, ... }:
+{
+
+  options.components.nixos.update-diff.enable = lib.mkOption {
+    type = lib.types.bool;
+    default = config.components.nixos.enable;
+  };
+
+  config = lib.mkIf (config.components.nixos.update-diff.enable) {
+    system.activationScripts.diff = {
+      supportsDryActivation = true;
+      text = ''
+        if [[ -e /run/current-system ]]; then
+          echo "--- diff to current-system"
+          ${config.nix.package}/bin/nix --extra-experimental-features nix-command store diff-closures /run/current-system "$systemConfig"
+          echo "---"
+        fi
+      '';
+    };
+  };
+}