How to write some text next to the system tray icon?

[alex chpenst]

Hi,
does anyone know how it's possible to put a text label next to the system tray icon?
(see also the attached picture).

First, I put an icon tray on the linux toolbar (works fine):

trayIcon = new QSystemTrayIcon(icon);

but I can't find any way to put some text beside the icon. How to do that?
Thanks for any suggestion!