diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..a5dbbcb
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use flake .
diff --git a/.gitignore b/.gitignore
index c4a847d..acf271d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /result
+/.direnv
diff --git a/flake.nix b/flake.nix
index 24575de..34b0889 100644
--- a/flake.nix
+++ b/flake.nix
@@ -50,8 +50,14 @@
       ssh.publicKeys.yubikey = "ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBLIUkESu5NnBi1M0+ZjYrkp6/rIFuwc3aguspf98jmOydNce6l65cnS3GRzc9oWx4lu11ahi87ZuE+pYV+gaHm4=";
       specialArgs = { inherit inputs bin ssh; };
       system = "x86_64-linux";
+      pkgs = nixpkgs.legacyPackages.${system};
     in
     {
+      devShells.${system}.default = pkgs.mkShell {
+        packages = with pkgs; [
+          nix-output-monitor
+        ];
+      };
       nixosConfigurations = {
         freun-dev = nixpkgs.lib.nixosSystem {
           inherit system specialArgs;