Flurry of Blows

At 1st level, a quarterstaff master can make a flurry of blows as a full attack. When making a flurry of blows, the monk can make one additional attack at his highest base attack bonus. This additional attack stacks with the bonus attacks from haste and other similar effects. When using this ability, the quarterstaff master can make these attacks only with quarterstaves. At 11th level, a quarterstaff master can make an additional attack at his highest base attack bonus whenever he makes a flurry of blows. This stacks with the first attack from this ability and additional attacks from haste and similar effects.