KNetworkManager settings, can't find documentation on this particular setting

Hi, I'm trying to figure out what this setting means:
'knetworkmanager - general configuration - connect automatically with priority'
Pic attached.

I have a wired connection, it value set during install is -100 and connects to a vpn wich has 0 as a value.

What do these mean, anybody knows?
Thanks!

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*UPDATE
I went today again through all KDE documentation, checked the KDE, Manjaro en Kubuntu sites, Wiki's etc. and no explanation of this particular setting. So, is -100 higher prio then 0, is it the other way around?

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