diff --git a/lib/slippery_slidy.mli b/lib/slippery_slidy.mli
index 5fd2e84..87544b7 100644
--- a/lib/slippery_slidy.mli
+++ b/lib/slippery_slidy.mli
@@ -8,13 +8,7 @@ type datalist =
   ; datalist_el : El.t
   }
 
-(* TODO can I hide this type completly? *)
-type widget
-
-type _ t =
-  | Text : widget -> string t
-  | Slider : widget -> float t
-  | Color : widget -> string t
+type _ t
 
 (** type for the step parameter of [mk_slider] Any is for continuous slider *)
 type step_kind =