rejected pics in Aperture - how to unreject them?

Hello guys,

today I did my first tethering with my D90 and after I finished my session I have edited two pics but noticed that they disappeared. Initially I've freaked out and thought they got deleted but eventually found them in 'rejected' folder. I have no idea how they got there and I can't find how to unreject them. Simple drag and drop to different folder doesn't work and can't find anything in the menu. Am I just being blind or how does one fix this, please?

Thank you

ok, never mind. I've found it. It was the rating issue. I didn't know you can rate as "rejected" when you press 9. Good to know for next time.
Problem solved