diff --git a/dotfiles/emacs.d/README.org b/dotfiles/emacs.d/README.org
index f85a866f..8e28b6fe 100644
--- a/dotfiles/emacs.d/README.org
+++ b/dotfiles/emacs.d/README.org
@@ -2892,6 +2892,10 @@ The following is taken from [[https://github.com/syl20bnr/spacemacs/blob/a650877
   :defer t
   :mode ("\\.kt\\'"))
 #+END_SRC
+*** swift
+#+begin_src emacs-lisp
+(use-package swift-mode)
+#+end_src
 *** groovy
 #+begin_src emacs-lisp
 (use-package groovy-mode)
diff --git a/nix-darwin/flake.nix b/nix-darwin/flake.nix
new file mode 100644
index 00000000..25528a17
--- /dev/null
+++ b/nix-darwin/flake.nix
@@ -0,0 +1,81 @@
+{
+  description = "Example Darwin system flake";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    nix-darwin.url = "github:LnL7/nix-darwin";
+    nix-darwin.inputs.nixpkgs.follows = "nixpkgs";
+    railbird-secrets = {
+      url = "git+ssh://gitea@dev.railbird.ai:1123/railbird/secrets-flake.git";
+    };
+    nix-homebrew.url = "github:zhaofengli-wip/nix-homebrew";
+
+    # Optional: Declarative tap management
+    homebrew-core = {
+      url = "github:homebrew/homebrew-core";
+      flake = false;
+    };
+    homebrew-cask = {
+      url = "github:homebrew/homebrew-cask";
+      flake = false;
+    };
+
+  };
+
+  outputs = inputs@{ self, nix-darwin, nixpkgs, ... }:
+  let
+    configuration = { pkgs, config, ... }: {
+      # List packages installed in system profile. To search by name, run:
+      # $ nix-env -qaP | grep wget
+      environment.systemPackages = with pkgs; [
+	      emacs
+        slack
+        gitFull
+        ripgrep
+        yarn
+        nodePackages.prettier
+        vim
+      ];
+
+      nixpkgs.config.allowUnfree = true;
+
+
+      # Auto upgrade nix package and the daemon service.
+      services.nix-daemon.enable = true;
+      services.yabai.enable = false;
+      launchd.user.envVariables.PATH = config.environment.systemPath;
+
+      programs.direnv.enable = true;
+
+      # Necessary for using flakes on this system.
+      nix.settings.experimental-features = "nix-command flakes";
+
+      # Create /etc/zshrc that loads the nix-darwin environment.
+      programs.zsh.enable = true;
+      program.bash.enable = true;
+
+      # Set Git commit hash for darwin-version.
+      system.configurationRevision = self.rev or self.dirtyRev or null;
+
+      # Used for backwards compatibility, please read the changelog before changing.
+      # $ darwin-rebuild changelog
+      system.stateVersion = 4;
+
+      # The platform the configuration will be used on.
+      nixpkgs.hostPlatform = "aarch64-darwin";
+      users.users.kat.openssh.authorizedKeys.keys = inputs.railbird-secrets.keys.kanivanKeys;
+    };
+  in
+  {
+    # Build darwin flake using:
+    # $ darwin-rebuild build --flake .#Kats-Mac-mini
+    darwinConfigurations."Kats-Mac-mini" = nix-darwin.lib.darwinSystem {
+      modules = [
+        configuration
+      ];
+    };
+
+    # Expose the package set, including overlays, for convenience.
+    darwinPackages = self.darwinConfigurations."Kats-Mac-mini".pkgs;
+  };
+}