MOSFET body diodes

I'm controlling a small DC motor with a MOSFET (irf7341). All diagrams I see have additional Schottky diodes in parallel with the MOSFET. I'm wondering if the body diode isn't enough in this application. The power level is small; I'm anticipating no more than 3A average drive current.

You might have guessed my education here consists almost entirely of application notes and datasheets. Is it just the reverse recovery time that indicates the need for an additional diode? The irf7341 has a t-rr of 90ns max, which seems quite fast. What am I looking for to guide the design? What search terms can I use to Google more info?

Thanks.
Mike. 

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