Needs review
Source: Player's Handbook

Description: You are skilled at grappling opponents.

Prerequisites: DEX 13, Improved Unarmed Strike

Required for: Armbar, Choke Hold, Earth's Embrace, Ki Throw, Scorpion's Grasp

You do not provoke an attack of opportunity when you make a touch attack to start a grapple. You also gain a +4 bonus on all grapple checks, regardless of whether you started the grapple.

Special

A fighter may select Improved Grapple as one of his fighter bonus feats. A monk may select Improved Grapple as a bonus feat at 1st level, even if she does not meet the prerequisites.

Normal

Without this feat, you provoke an attack of opportunity when you make a touch attack to start a grapple.