certificates in the trusted CA storage, see
L<SSL_CTX_load_verify_locations(3)|SSL_CTX_load_verify_locations(3)>.
+=head1 RESTRICTIONS
+
+Only one set of extra chain certificates can be specified per SSL_CTX
+structure. Different chains for different certificates (for example if both
+RSA and DSA certificates are specified by the same server) or different SSL
+structures with the same parent SSL_CTX cannot be specified using this
+function. For more flexibility functions such as SSL_add1_chain_cert() should
+be used instead.
+
=head1 RETURN VALUES
SSL_CTX_add_extra_chain_cert() returns 1 on success. Check out the
L<ssl(3)|ssl(3)>,
L<SSL_CTX_use_certificate(3)|SSL_CTX_use_certificate(3)>,
+L<SSL_CTX_set_client_cert_cb(3)|SSL_CTX_set_client_cert_cb(3)>,
L<SSL_CTX_load_verify_locations(3)|SSL_CTX_load_verify_locations(3)>
+L<SSL_CTX_set0_chain(3)|SSL_CTX_set0_chain(3)>
+L<SSL_CTX_set1_chain(3)|SSL_CTX_set1_chain(3)>
+L<SSL_CTX_add0_chain_cert(3)|SSL_CTX_add0_chain_cert(3)>
+L<SSL_CTX_add1_chain_cert(3)|SSL_CTX_add1_chain_cert(3)>
+L<SSL_set0_chain(3)|SSL_set0_chain(3)>
+L<SSL_set1_chain(3)|SSL_set1_chain(3)>
+L<SSL_add0_chain_cert(3)|SSL_add0_chain_cert(3)>
+L<SSL_add1_chain_cert(3)|SSL_add1_chain_cert(3)>
+L<SSL_CTX_build_cert_chain(3)|SSL_CTX_build_cert_chain(3)>
+L<SSL_build_cert_chain(3)|SSL_build_cert_chain(3)>
=cut