diff --git a/src/controls/mod.rs b/src/controls/mod.rs
index f8bba51..d65e289 100644
--- a/src/controls/mod.rs
+++ b/src/controls/mod.rs
@@ -21,6 +21,12 @@ pub trait VanityControlData: 'static {
     fn build_control<FS: FormStyle>(fs: &FS, control: ControlRenderData<FS, Self>) -> View;
 }
 
+// TODO: what if the `FS` parameter was extracted to the trait level.
+// Then this would be trait object able.
+// If this is trait object able, then we can store this in a list,
+// and differ rendering the control until we actually need to form view.
+// Which, in turn, would get rid of the Form Builder as an enum (which was
+// done to avoid rendering on the server).
 pub trait ControlData: 'static {
     type ReturnType: Clone;