LDC Racing Saliboats RS FEVA Owner's Manual page 74

Pass the tail around the standing rope
Thread the tail back through the loop, and tighten
Knot-on-Knot
A „knot-on-knot‟ is useful for tying the end of a rope to a sail or a fitting, and is
particularly reliable due to the manner in which the rope binds upon itself.
Tie a single overhand knot in the end of the rope. Feed
the rope through the sail or the fitting, and tie another
overhand knot in the rope.
Pull the rope tight so that the rope binds on the original
overhand knot.