I just gave 3 people warnings about not crediting. You know who you are.
If you don't credit, I will find you out. Not knowing how is not an excuse, since I tell you how in the rules on the info page. I'm not a complete nazi, though. I'll warn you and give you a 1 week grace period to get your act together before I kick you out. We're a small, friendly community. So please, let's not make it smaller.
If anyone else happens to notice a lack of crediting, please report it to me at firstname.lastname@example.org