gnome-boxes in "dnf list extras"

[Braden McDaniel]

How come gnome-boxes is showing up in "dnf list extras"?

   $ sudo dnf mark install gnome-boxes
   gnome-boxes-3.30.1-2.fc29.1.x86_64 marked as user installed.
   $ dnf list extras
   Extra Packages
   gnome-boxes.x86_64                            3.30.1-2.fc29.1      @updates     

This system was upgraded from F28 to F29 via "dnf system-upgrade",
FWIW. (Graphical upgrade refused to work.)

Am I misunderstanding what "dnf mark install" does?

-- 
Braden McDaniel <braden(a)endoframe.com&gt;