+.It Fl S Ar program
+Name of
+.Ar program
+to use for the encrypted connection.
+The program must understand
+.Xr ssh 1
+options.
+.It Fl o Ar ssh_option
+Can be used to pass options to
+.Nm ssh
+in the format used in the
+.Xr ssh 1
+configuration file. This is useful for specifying options
+for which there is no separate
+.Nm scp
+command-line flag. For example, forcing the use of protocol
+version 1 is specified using
+.Ic scp -oProtocol=1 .