diff --git a/modules/examples/simple.nix b/modules/examples/simple.nix
index 68321df6..d3cde9c0 100644
--- a/modules/examples/simple.nix
+++ b/modules/examples/simple.nix
@@ -7,6 +7,10 @@
     [ pkgs.nix-repl
     ];
 
+  # Auto upgrade nix package and the daemon service.
+  # services.nix-daemon.enable = true;
+  # nix.package = pkgs.nix;
+
   # Create /etc/bashrc that loads the nix-darwin environment.
   programs.bash.enable = true;
   # programs.zsh.enable = true;