Purpose of 'naming' an include or extend


This question has more to do with ideas than physical implementation.

I am using UML4.1 and have been creating Use Case diagrams. I notice that I am given the option to give a name to include or extend lines that I draw.

My problem is I do not understand the thinking behind why one should wish to name these items, since surely the purpose of this include/extend is shown by the connected Use Cases?

This is not a major point, but if I am missing a very useful feature then I would hate to miss out.