Arrow for subitems

[Fa-b]

I couldn't find/figure why the right arrow wouldn't show up for subitems. At first I suspected this to be set via css, since items that contain subitems set the has-subitems class. Apparently though, at the moment the hotkey property is used on the item: hotkey: '❯'. Would be helpful if that was explained in the README or shown in the example there.