Its a great idea to tell your team if you see certain enemies hit 6

If I see hit 6, or show on the map when they just hit 6, I immediately type it to my team so they dont get ported/jumped on without expecting it.

Its also not a bad idea to point out if you see the enemy jungler is 6 if they are a more Ult reliant Jungler like etc, or any of the ones I mentioned above.