;;; custom.el --- tools for declaring and initializing options
;;
;; Copyright (C) 1996, 1997, 1999, 2001, 2002, 2003, 2004,
-;; 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+;; 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
;;
;; Author: Per Abrahamsen <abraham@dina.kvl.dk>
;; Maintainer: FSF
(defun custom-initialize-delay (symbol value)
"Delay initialization of SYMBOL to the next Emacs start.
-This is used in files that are preloaded, so that the initialization is
-done in the run-time context rather than the build-time context.
-This also has the side-effect that the (delayed) initialization is performed
-with the :setter."
+This is used in files that are preloaded (or for autoloaded
+variables), so that the initialization is done in the run-time
+context rather than the build-time context. This also has the
+side-effect that the (delayed) initialization is performed with
+the :set function.
+
+For variables in preloaded files, you can simply use this
+function for the :initialize property. For autoloaded variables,
+you will also need to add an autoload stanza calling this
+function, and another one setting the standard-value property.
+See `send-mail-function' in sendmail.el for an example."
;; Until the var is actually initialized, it is kept unbound.
;; This seemed to be at least as good as setting it to an arbitrary
;; value like nil (evaluating `value' is not an option because it