PFSRD:Exotic Weapon Proficiency
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Exotic Weapon Proficiency (Combat)
Choose one type of exotic weapon, such as the spiked chain or whip. You understand how to use that type of exotic weapon in combat, and can utilize any special tricks or qualities that exotic weapon might allow.
Prerequisite: Base attack bonus +1.
Benefit: You make attack rolls with the weapon normally.
Normal: A character who uses a weapon with which he is not proficient takes a –4 penalty on attack rolls.
Special: You can gain Exotic Weapon Proficiency multiple times. Each time you take the feat, it applies to a new type of exotic weapon.