Front or rear wheel, or both?

On a rear wheel the drive-side spokes will be noticeably tighter than the non-drive side. In many cases the non-drive side will almost feel slack.

Go to the Mavic web-site and find out the applicable spoke tension for your rims and then see how yours compare. If yours are out of spec, then re-tensioning is critical to avoid spoke breakage or rim failure.

Bob