You have mastered a wide range of weapons. Your training with one specific weapon now extends to other weapons of a similar sort.
Prerequisites: Proficiency, Weapon Focus, and Weapon Specialization with selected weapon; base attack bonus +8.
Benefit: When you select this feat, choose bludgeoning, piercing, or slashing. You must have Weapon Focus and Weapon Specialization with a melee weapon that deals this type of damage. When using any melee weapon that has the damage type you selected, you gain a +2 bonus on attack rolls and a +2 bonus on damage rolls. For weapons with two damage types, such as the morningstar, which does bludgeoning and piercing damage, the benefits of Melee Weapon Mastery (bludgeoning) and Melee Weapon Mastery (piercing) do not stack. The bonuses from this feat do stack with those gained from Weapon Focus and Weapon Specialization.
Special: You can select this feat more than once. Each time, you can select a new damage type.
A fighter can select Melee Weapon Mastery as one of his fighter bonus feats.
Source: Player’s Handbook II, page 81. Errata corrected for errata.