Sec.  15.21   Information to user.

   The users manual or instruction manual for an intentional or unintentional
   radiator shall caution the user that changes or modifications not expressly
   approved by the party responsible for compliance could void the user's
   authority to operate the equipment. In cases where the manual is provided
   only in a form other than paper, such as on a computer disk or over the
   Internet, the information required by this section may be included in the
   manual  in  that alternative form, provided the user can reasonably be
   expected to have the capability to access information in that form.

   [ 54 FR 17714 , Apr. 25, 1989, as amended at  68 FR 68545 , Dec. 9, 2003]