LED,
It's just a standard hangman's noose - maybe the correct name is Reeve Coil Knot. You probably already know how to tie it, but just in case, here's the link:
http://www.chrisreeve.com/knotright.htm

It also gives a few inches of cord or rope or leather if you ever needed it. You'd just unravel it. On some ofmy larger knives, the cord is, of course, much longer.