ntp-doc 1:4.2.0a+stable-8.1ubuntu4 (amd64 binary) in ubuntu dapper

 NTP, the Network Time Protocol, is used to keep computer clocks accurate
 over the Internet, or by following an accurate hardware receiver which
 interprets GPS, DCF-77, NIST or similar time signals.
 .
 This package contains HTML documentation for the ntp packages (ntp,
 ntpdate, ntp-simple, ntp-refclock). Since there are no substantive man
 pages for ntp's programs and configuration files, this package is
 desirable for any setup beyond the simple configuration supplied by the
 server packages.