Knot Nerds: The Improved Clinch Knot

The Improved Clinch knot is a great fishing knot to know and is best utilized when you are dealing with stiff materials that don't seat well with the basic Clinch Knot. Simply run the tag end back through the "D-loop" created when you tie the Clinch Knot and viola, you have the improved clinch knot.
You might encounter a situation that calls for an improved clinch knot when you find yourself saltwater fly fishing, streamer fishing, or when the diameter of the hook eye is noticeably different than the leader/tippet material you're working with.

[@seven11dmd]

good insight into why one would choose the improved clinch over the clinch. I haven't found a need for it!