How do I find out what AT&T updated on my Zenfone 2E?

[Traijan]

I turned on my phone (from sleep/black screen) and there was a full screen window telling me that AT&T had an update, and asked if I wanted to update now or remind me later.

I'm doing the update (it says Installing system update... 60%, so far) but is there some way to see what it is exactly that they updated?