List of manual pages that are missing or just exist as a stub. The goal is to keep these lists as short as possible 
There is Bugzilla issue which tracks all bug reports regarding a missing manual page. Please start there first.
Please see missing_manpages.txt for the output of a crude script that attempts to determine missing manpages from the contents of various DEFAULTS and GENERIC files, and the contents of various binary directories.
Missing Manpages
- cxgbtool(8)
- drm(4)
gzero(4) (http://lists.freebsd.org/pipermail/freebsd-current/2007-August/075819.html)
- ofw(4)
- ofwcons(4)
- tsec(4)
sched_getaffinity(3), sched_setaffinity(3) https://bugs.freebsd.org/265249
Manpage Stubs
- acpi_dock(4)
Missing Documentation
- kern.ipc.sem* TUNABLES/sysctls