-@click.option('--overwrite', default=None,
- help='overwrites some fields in NSD')
+@click.option('--overwrite', 'overwrite', default=None,
+ help='overwrite deprecated, use override')
+@click.option('--override', 'overwrite', default=None,
+ help='overrides fields in descriptor, format: '
+ '"key1.key2...=value[;key3...=value;...]"')