diff --git a/flake.nix b/flake.nix
index 5b4ce85..5a8d426 100644
--- a/flake.nix
+++ b/flake.nix
@@ -23,8 +23,16 @@
       };
     });
 
-    packages = forAllSystems (_: pkgs: {
-      default = lib.pipe ./main.py [
+    overlays = {
+      default = self.overlays.passwd2systemd-users;
+      passwd2systemd-users = final: prev: {
+        inherit (self.packages.${prev.stdenv.hostPlatform.system}) passwd2systemd-users;
+      };
+    };
+
+    packages = forAllSystems (system: pkgs: {
+      default = self.packages.${system}.passwd2systemd-users;
+      passwd2systemd-users = lib.pipe ./main.py [
         lib.readFile
         (lib.splitString "\n")
         lib.tail