diff --git a/gi-gtk-declarative/src/GI/Gtk/Declarative/Patch.hs b/gi-gtk-declarative/src/GI/Gtk/Declarative/Patch.hs
index c9604ee..9c32204 100644
--- a/gi-gtk-declarative/src/GI/Gtk/Declarative/Patch.hs
+++ b/gi-gtk-declarative/src/GI/Gtk/Declarative/Patch.hs
@@ -34,5 +34,5 @@ class Patchable widget where
   -- | Given two declarative widgets of the same widget type (but not
   -- necessarily of the same event types,) calculate a 'Patch'.
   patch :: SomeState -> widget e1 -> widget e2 -> Patch
-  -- | Todo: ...
+  -- | Given a previously created declarative widget, destroy it.
   destroy :: SomeState -> widget e -> IO ()