This package contains additional XFree86 online manual pages. This
includes developer documentation (in man format) for Xlib, OpenGL drawing,
X11 Nonrectangular Window Shape Extension, Double Buffer Extension
(DBE), X Extended Visual Information, Resource Manager, X Toolkit
Intrinsics, video processing, and other X-related programming.

XFree86-man also provides:
  X - a portable, network-transparent window system
  X.Org, XProjectTeam - X.Org Group information
  XConsortium - X Consortium information
  XStandards - X Consortium Standards and X Project Team Specifications
  Xsecurity - X display access control