where is kriya visheshan i have to revise it?

it is in my course

Kriya ki Visheshta batane wale shabdon ko Kriya Visheshan Kehte hai. 
E.g. Veh TEZ DAUDTA hai.

In this sentence, daudta is a Kriya and Tez is it's Visheshan
So tez Daudta is Kriya Visheshan.