Very straight forward... just allows you to set an obsolete tech for a unit without having to make the unit upgrade to something else. For those of you sick of your horses turning into helicopters 
Somebody might've done this already, but here it is on its own at least...
No screenshots this time, but the civilopedia does correctly show the tech and the unit it obsoletes in each of the pedia entries.
Somebody might've done this already, but here it is on its own at least...No screenshots this time, but the civilopedia does correctly show the tech and the unit it obsoletes in each of the pedia entries.