kench range nerfs?

i'm a supp player and since tahm was released he's been my go to support (apparently i'm quite good at him (that's what my mum says anyway)).

just wondering why he got a range nerf. i'd understand if riot are thinking "melee champs all need to have 'melee' range so i'm terribly sorry tahm we're going to cut you're tong in half" but they buffed nasus and xin zhao in the same patch.

if anyone knows why he got the nerf please tell me.

its not that big of a deal but i'm just confused as to why they lowered the range as i thought it was fine. :P