* lisp/electric.el (electric-indent-post-self-insert-function): Add doc.

lisp/ChangeLog

+2014-03-21  Glenn Morris  <rgm@gnu.org>
+
+	* electric.el (electric-indent-post-self-insert-function): Add doc.
+
 2014-03-21  Dmitry Gutov  <dgutov@yandex.ru>
 	* emacs-lisp/package.el (package-compute-transaction):

lisp/electric.el

@@ -228,6 +228,10 @@ not try to reindent lines.  It is normally better to make the major
 mode set `electric-indent-inhibit', but this can be used as a workaround.")
 
 (defun electric-indent-post-self-insert-function ()
+  "Function that `electric-indent-mode' adds to `post-self-insert-hook'.
+This indents if the hook `electric-indent-functions' returns non-nil,
+or if a member of `electric-indent-chars' was typed; but not in a string
+or comment."
   ;; FIXME: This reindents the current line, but what we really want instead is
   ;; to reindent the whole affected text.  That's the current line for simple
   ;; cases, but not all cases.  We do take care of the newline case in an