diff --git a/modules/global/options.nix b/modules/global/options.nix
index 46bc893..c3bbd4d 100644
--- a/modules/global/options.nix
+++ b/modules/global/options.nix
@@ -38,6 +38,8 @@ in
     universe = {
       packages = mkOpt (listOf package) [ ];
     };
+
+    common = mkOpt (attrsOf anything) { };
   };
 
   config = {