The Pistolero deed reads as:
Up Close and Deadly (Ex) At 1st level, when the pistolero hits a target with a one-handed firearm that is not making a scatter shot, she can spend 1 grit point to deal 1d6 points of extra damage on a hit. If she misses with the attack, she grazes the target, dealing half the extra damage anyway. This is precision damage and is not multiplied if the attack is a critical hit. This precision damage increases to 2d6 at 5th level, to 3d6 at 10th level, to 4d6 at 15th level, and to 5d6 at 20th level.
So if I understand this RAW I don't have to declare until after I've hit.
Is that correct?