+=item B<prefix =E<gt> EXPR>
+
+If specified, EXPR will be used as a string to prefix the output from the
+command. This is useful if the output contains lines starting with C<ok >
+or C<not ok > that can disturb Test::Harness.
+
+=item B<statusvar =E<gt> VARREF>
+
+If used, B<VARREF> must be a reference to a scalar variable. It will be
+assigned a boolean indicating if the command succeeded or not. This is
+particularly useful together with B<capture>.
+