Turn off auto-caption on Olympus cameras?

By default, all of my OM-D and E-PL1 files have the following caption in the IPTC Caption field:

OLYMPUS DIGITAL CAMERA

Ummm, okay... thanks for that Olympus. As if I couldn't tell from the EXIF data... 

Does anyone know if there's a way to turn this auto-captioning off? I'd prefer it if the IPTC Caption field were left blank. After all, OLYMPUS DIGITAL CAMERA is a pretty meaningless caption.

Thanks.