The tag is present in Lintian version 2.104.264. That is the most recent version we know about.
The package "Description:" contains an unindented line which starts with a dash (-) or asterisk (*). If this was meant to be a list of items these lines need to be indented (dselect would word-wrap these lines otherwise).
Refer to Debian Policy Manual section 5.6.13 for details.