diff --git a/README.md b/README.md
index 52d6a9c..916823d 100644
--- a/README.md
+++ b/README.md
@@ -28,4 +28,6 @@ https://github.com/NixOS/nixpkgs/blob/nixos-22.11/nixos/modules/system/boot/tmp.
 
 andere nützliche links:
 
-https://nixos.org/manual/nixos/stable/index.html#sec-writing-modules
\ No newline at end of file
+https://nixos.org/manual/nixos/stable/index.html#sec-writing-modules
+
+https://github.com/NixOS/nixpkgs/blob/nixos-22.11/nixos/modules/config/users-groups.nix