Improved Two-Weapon Fighting (General)
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Prerequisites: Dexterity 17, Two-Weapon Fighting, base attack bonus +6.
Benefit: In addition to the standard single extra attack you get with an off-hand weapon, you get a second attack with it, albeit at a -5 penalty.
Normal: Without this feat, you can only get a single extra attack with an off-hand weapon.
Special: A fighter may select Improved Two-Weapon Fighting as one of his fighter bonus feats.
A 6th-level ranger who has chosen the two-weapon combat style is treated as having Improved Two-Weapon Fighting, even if he does not have the prerequisites for it, but only when he is wearing light or no armor.