I was afraid I would have trouble explaining it. The lines, or line and leader, are coming at one another from opposite directions and laid together. When the loop is made they are treated as one. The loose ends are then wrapped around the loop strands, one from each direction. These are trimmed after the knot is tightened.
Hope that helps. I've used this knot seemingly forever to attach leaders. After braid came on the scene I found it seems to work well with it also. On most of my bass rods I'm using 6/20 braid, moving to 8/30 when I change lines, with a leader. So far I like the combination because it very flexible. I can tie on a leader long enough to reach the reel, not through the level wind, of whatever seems appropriate. It gives me something to sacrifice to knots, to fit conditions of abrasion or water clarity, and the braid last an incredible length of time.