sunfire cape, i noticed something odd about it is it a bug or intended?

So just just finished a and i bought a

Now once i got the i noticed something odd

Something i had not really noticed earlier but the damage aura seems to work on towers. Now i do not know if this is something intended or a bug as i this is something ive only recently seen happen.

I really like it tho as it gives me an option for tanks to actually splitpush, usually shoving the wave up isnt much of a problem but when you then get to a tower it takes 7 years to kill it. Yes i know towers are weak and all and i agree everyone who buys even a single damage item can push them fast enough, except tanks they really struggle taking towers. So i was really happy this worked on turrets so if it is unintended i hope Riot can keep this as a feature