docs/174045: Explanation missing in manual

[wblock at FreeBSD.org]

Synopsis: Explanation missing in manual

Responsible-Changed-From-To: freebsd-doc->wblock
Responsible-Changed-By: wblock
Responsible-Changed-When: Sun Dec 2 14:53:25 UTC 2012
Responsible-Changed-Why: 
Take.

http://www.freebsd.org/cgi/query-pr.cgi?pr=174045