Needs review
Source: Secrets of the Crane

Description: You are always ready to draw your Katana

Prerequisites: DEX 13, Base Attack Bonus +6, Way of the Crane, Martial Weapon Proficiency (Katana), Weapon Focus (Katana)

You may draw your katana as a free action at any time, even when it is not your turn or you are surprised so long as you have a free hand. You gain a +2 circumstance bonus on all attacks of opportunity with a katana and may make attacks of opportunity with a katana anytime one is incurred even if you are flatfooted.