Dante Profeta <dante@mclink.it> typed:
:Today I noticed that -k option of man is not documented (on i386). Is
:this already known?

And yet it references apropos(1) down the bottom.  You're quite welcome to
go ahead and submit a pr with a description.
-- 
Geoff Wing   <gcw@pobox.com>            Mobile : 0412 162 441
Work URL: http://www.primenet.com.au/   Ego URL: http://pobox.com/~gcw/