ntp-doc 1:4.2.0a+stable-8.1ubuntu2 (amd64 binary) in ubuntu dapper

Network Time Protocol: documentation
 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.