Nocturnes Passive tool tip doesn't show that Auto's reduce it by 1 second

http://grabilla.com/0570b-700808b4-0225-4840-bdd4-ca18fcff792a.png

What is should say Every 10 seconds Nocturne's next basic attack is periodically enhanced, dealing 120% AD physical damage to the main target and surrounding enemies, and healing himself for 10 / 18 / 26 health per enemy hit. Basic attacks reduce Umbra Blades's cooldown by 1 second.