Do not use the default directory of trusted certificates.
+=item B<-CAstore> I<uri>
+
+Use I<uri> as a store of trusted CA certificates. The URI may
+indicate a single certificate, as well as a collection of them.
+With URIs in the C<file:> scheme, this acts as B<-CAfile> or
+B<-CApath>, depending on if the URI indicates a single file or
+directory.
+See L<ossl_store-file(7)> for more information on the C<file:> scheme.
+
+These certificates are also used when building the server certificate
+chain (for example with L<openssl-s_server(1)>) or client certificate
+chain (for example with L<openssl-s_time(1)>).
+
+=item B<-no-CAstore>
+
+Do not use the default store.
+
=back
=head2 Random State Options