contact customized notification ringtone

[Android Question]

I have a Galaxy s2 and before I had to return to factory settings I had customized notification ringtones for some of my contacts so I could differentiate between those texts I wanted to respond to immediately and those I didn't. I can't figure out how I did it!! Help! It's driving me crazy!!
Thanks for any assistance you can offer.

 

[Rukbat]

How you do it depends on the contacts app you're using but basically edit the contact (long-press it, scroll down to edit, press) and you should see a 'ringtone' item. Select a ringtone for that contact.