diff --git a/flake.nix b/flake.nix
index 5f9a910..3b07569 100644
--- a/flake.nix
+++ b/flake.nix
@@ -14,7 +14,12 @@
       ["x86_64-linux" "aarch64-linux"]
       (system: fn system nixpkgs.legacyPackages.${system});
   in {
-    # Define a package for your project
+    # Overlay for using this in system configurations.
+    overlays.default = forEachSystem (system: (final: prev: {
+      zsh = self.packages.zsh.system.default;
+    }));
+
+    # Package so you can test this out, without installing :3.
     packages = forEachSystem (system: pkgs: rec {
       zsh = import ./nix/wrapZsh.nix {
         inherit pkgs;