The tag is present in Lintian version 2.104.232. That is the most recent version we know about.
Symbolic links to the undocumented(7) manual page may be provided if no manual page is available, but that is deprecated.
The lack of a manual page is still a bug, and if at all possible you should write one yourself.
For help with writing manual pages, refer to the
Man-Page-HOWTO, the examples created
dh_make, or the
If the package provides
--help output, you might want to use
help2man utility to generate a simple manual page.
Refer to Debian Policy Manual section 12.1 for details.