=head1 NOTES
These functions have no impact when used with DTLS. The return values for
-SSL_CTX_get_read_head() and SSL_get_read_ahead() are undefined for DTLS.
+SSL_CTX_get_read_head() and SSL_get_read_ahead() are undefined for DTLS. Setting
+B<read_ahead> can impact the behaviour of the SSL_pending() function
+(see L<SSL_pending(3)>).
=head1 RETURN VALUES
=head1 SEE ALSO
-L<ssl(3)|ssl(3)>
+L<ssl(3)>, L<SSL_pending(3)>
=cut