This firmware update for the D90 and D5000 only will correct distortion issues .
Nikon says., ““The Distortion Control Data firmware upgrade is available for Nikon D90 and D5000 cameras only. This is used to correct barrel and pincushion distortion during shooting and editing. This may be loaded into cameras that support distortion control.” Nikon
Details on how to update your cameras firmware are here:
H/T Nikon Rumors