Slaying arrows and crits

[NobodysHome]

OK, my Google fu and Messageboard fu have both failed, but this one seems so obvious I can't help feeling I just missed a thread somewhere.

Does the extra damage from a "slaying arrow" get multiplied on a crit?

Seems like since it's a damage bonus rather than a dice bonus it should, but "Roll a DC23 Fort save or take 300 points of damage" is a pretty nasty bit of work.

How have people ruled on this?

[Nefreet]

Just the weapon damage dice, and any bonuses you'd normally apply. The damage requiring a save would not get multiplied.

[Zhayne]

Never mind, misunderstood the question.