Your unarmed strikes cause your opponent to bleed.
Prerequisites: Improved Unarmed Strike.
Benefit: When you damage an opponent with an unarmed strike, you deal an extra 1d4 bleed damage.
Special: This ability does not stack with other special abilities, attacks, or items that allow you to deal bleed damage.
What exactly does this mean? An extra d4 per hit? Opponent gains the bleeding condition for d4 points every turn? d4x(hits) per turn?