activation-scripts: add extra comment

modules/system/activation-scripts.nix

@@ -101,6 +101,8 @@ in
 
       ${cfg.activationScripts.preUserActivation.text}
 
+      # This should be running at the system level, but as user activation runs first
+      # we run it here with sudo
       ${cfg.activationScripts.createRun.text}
       ${cfg.activationScripts.checks.text}
       ${cfg.activationScripts.etcChecks.text}