diff --git a/modules/dgn-web.nix b/modules/dgn-web.nix
index f0ade3d..ca99a67 100644
--- a/modules/dgn-web.nix
+++ b/modules/dgn-web.nix
@@ -72,6 +72,10 @@ in
           };
         };
       });
+      default = { };
+      description = ''
+        A set of simple localhost redirections.
+      '';
     };
   };