since it piqued my curiosity, i decided to ask on the rpm list about
$ man -k yelp
yelp (rpm) - A system documentation reader from the Gnome project
apparently, all it means is that that information is being pulled out
of the "whatis" database, and is effectively the same as what you'd
get from grepping the file /var/cache/man whatis.
quite simply, package names and one-line summaries have been added to
the whatis database for quite some time now in response to this
so that's while you'll see normal man output for, say, "strace"
$ man strace
STRACE(1) ... blah blah ...
but you'll also see:
$ man -k strace
autrace (8) - a program similar to strace
strace (1) - trace system calls and signals
strace (rpm) - Tracks and displays system calls associated with a running
it's also why, even when a command like "yelp" has no actual man page,
you're still likely to see that single-line, package-related "(rpm)"
entry for it.
huh. learn something every day.
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA