+=item B<-client_sigalgs sigalglist>
+
+Signature algorithms to support for client certificate authentication
+(colon-separated list)
+
+=item B<-named_curve curve>
+
+Specifies the elliptic curve to use. NOTE: this is single curve, not a list.
+For a list of all possible curves, use:
+
+ $ openssl ecparam -list_curves
+