to be added when a certificate is issued (defaults to B<x509_extensions>
unless the B<-extfile> option is used). If no extension section is
present then, a V1 certificate is created. If the extension section
-is present (even if it is empty), then a V3 certificate is created.
+is present (even if it is empty), then a V3 certificate is created. See the:w
+L<x509v3_config(5)|x509v3_config(5)> manual page for details of the
+extension section format.
=item B<-extfile file>
=item B<-engine id>
-specifying an engine (by it's unique B<id> string) will cause B<req>
+specifying an engine (by its unique B<id> string) will cause B<ca>
to attempt to obtain a functional reference to the specified engine,
thus initialising it if needed. The engine will then be set as the default
for all available algorithms.
created, if the CRL extension section is present (even if it is
empty) then a V2 CRL is created. The CRL extensions specified are
CRL extensions and B<not> CRL entry extensions. It should be noted
-that some software (for example Netscape) can't handle V2 CRLs.
+that some software (for example Netscape) can't handle V2 CRLs. See
+L<x509v3_config(5)|x509v3_config(5)> manual page for details of the
+extension section format.
=back
=head1 SEE ALSO
L<req(1)|req(1)>, L<spkac(1)|spkac(1)>, L<x509(1)|x509(1)>, L<CA.pl(1)|CA.pl(1)>,
-L<config(5)|config(5)>
+L<config(5)|config(5)>, L<x509v3_config(5)|x509v3_config(5)>
=cut