Constraining PLL in TimeQuest

Thank you golgo. I followed your suggestion ,

and reflect new frequsnecy in TimeQuest's clock Summary.

so I have a question.

what's meaning of -use_tan_name in derive_pll_clocks Command?

on-line help said

-create_base_clocks: Creates base clocks on input clock ports of the design that are feeding the PLL

-use_tan_name: Use net names as clock names

I could understand -create_base_clocks, but I couldn't understand -use_tan_name.