MOT advisory?

[MrAndyW]

Advisory notice item(s)
no smoke (emissions) peak detected, system too clean.

Just doing an MOT check on a potential car purchase, This was on the MOT carried out on 8th June 2016.
can anybody tell me what it means please. and is it anything to worry about.
Never seen anything like that before, It's a 3.0L v6 Jag diesel.
Thanks Andy.

[MrAndyW]

Thanks for the replies.
Like you say it's crazy to to put down somethng that isn't a fault.
Just had me a bit worried because I'd never seen anything like that before,worth looking at the car now.
Thanks again.