A file or URI of untrusted certificates to use when attempting to build the
certificate chain related to the certificate specified via the B<-cert> option.
+These untrusted certificates are sent to clients and used for generating
+certificate status (aka OCSP stapling) requests.
The input can be in PEM, DER, or PKCS#12 format.
=item B<-build_chain>
Enables certificate status request support (aka OCSP stapling) and gives
a verbose printout of the OCSP response.
+Use the B<-cert_chain> option to specify the certificate of the server's
+certificate signer that is required for certificate status requests.
=item B<-status_timeout> I<int>