[dev] [dwm] switch tag with mouse wheel on root

Hello dear dwm users,

I was just wondering how could I switch to the next or previous tag by
using the mouse wheel on root window.

I think I must add the following :

{ ClkRootWin, MODKEY, Button4, ?? }
{ ClkRootWin, MODKEY, Button5, ?? }

But I don't know what I must add in the argument colon.

Kind regards,

--
David Demelier