@deftypefun {void} {gnutls_supplemental_send} (gnutls_session_t @var{session}, unsigned @var{do_send_supplemental})
@var{session}: is a @code{gnutls_session_t}  type.

@var{do_send_supplemental}: non-zero in order to send supplemental data

This function is to be called by an extension handler to
instruct gnutls to send supplemental data during the handshake process.

@strong{Since:} 3.4.0
@end deftypefun