From the manual page: > Convert to and from the old pkg_add(1) format. The .Xr in the linked commit (2013) is no longer appropriate; pkg_add(1) no longer exists.
I'll make a pull request.
Noted with thanks: <https://github.com/freebsd/pkg/commit/724d9bb97c1e3b0970daa069de3b7600b6a3a952> > pkg(8): undocument convert subcommand which has been removed bapt@ would you like to close this report?