Swift Aid
With a quick but harmless swipe, you can aid an ally’s assault.
Prerequisite: Int 13, Combat Expertise, base attack bonus +6.
Benefit: As a swift action, you can attempt the aid another action, granting your ally either a +1 bonus on his next attack roll or a +1 bonus to his AC.
Normal: Aid another is a standard action.
Source: Advanced Player's Guide, p. 172