-C<$taint_mode> is a boolean that specifies if the script should be run under taint mode.
-If C<undef> is passed (which is the default), the constructor will try to infer it from the shebang line of the script.
+This option is mandatory.
+
+=item *
+
+C<$taint_mode> is actually handled by the parent class L<Test::Valgrind::Command::Perl>, but it gets special handling in this subclass : if C<undef> is passed (which is the default), the constructor will try to infer its right value from the shebang line of the script.
+
+=back