[English idiom connected with communicating // angielski idiom związany z komunikacją]
A/ I’ll try to talk to Monique today and we’ll see what she says about the entire situation.
B/ Well, OK, KEEP ME POSTED then.
The phrase to keep somebody posted means keeping someone informed about a particular issue. You may ask someone to keep you posted as in the example above, or you may offer that you will let somebody know as soon as you get some information by saying I’ll keep you posted.