diff --git a/modules/system/defaults/LaunchServices.nix b/modules/system/defaults/LaunchServices.nix
index 0ab5ca9..d9ffcda 100644
--- a/modules/system/defaults/LaunchServices.nix
+++ b/modules/system/defaults/LaunchServices.nix
@@ -8,6 +8,9 @@ with lib;
     system.defaults.LaunchServices.LSQuarantine = mkOption {
       type = types.nullOr types.bool;
       default = null;
+      description = ''
+        Whether to enable quarantine for downloaded applications.  The default is true.
+      '';
     };
 
   };