You can make additional attacks of opportunity.

Benefit: You may make a number of additional attacks of opportunity per round equal to your Dexterity bonus. With this feat, you may also make attacks of opportunity while flat-footed.

Normal: A character without this feat can make only one attack of opportunity per round and can't make attacks of opportunity while flat-footed.

Special: The Combat Reflexes feat does not allow a rogue to use her opportunist ability more than once per round.