How low does MFP go calorie wise?

Ok, i tried searching to see if this was asked/answered before but didn't find anything. So, as I have lost weight MFp has cranked the calories down on me. i stared being able to eat 1850, now I am down to 1650. Does MFP just keep lowering the calorie goal? Where does it stop? 1000? 900? I still have a long way to go and at this rate I might be down to that 1000 calorie. I know I can always up my activity to get more calories. But I am just curious.