* custom.el (custom-initialize-delay): Doc fix.

1 files changed, 11 insertions, 4 deletions

diff --git a/lisp/custom.el b/lisp/custom.el
index 347b2e1bebf..2484ee26f21 100644
--- a/lisp/custom.el
+++ b/lisp/custom.el
@@ -113,10 +113,17 @@ For the standard setting, use `set-default'."
 
 (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