Add a customization group link from whitespace-mode

* lisp/whitespace.el (whitespace-mode): Add a link to the
whitespace customization group to see the faces (bug#18296).

diff --git a/lisp/whitespace.el b/lisp/whitespace.el
index a2dc6ab9814e1f9ed93d94bc89e7b5b498b8fed4..a3a127474d365d4a084fb568f50db6f268149ad8 100644 (file)
--- a/lisp/whitespace.el
+++ b/lisp/whitespace.el
@@ -924,7 +924,10 @@ Any other value is treated as nil."
   "Toggle whitespace visualization (Whitespace mode).
 
 See also `whitespace-style', `whitespace-newline' and
-`whitespace-display-mappings'."
+`whitespace-display-mappings'.
+
+This mode uses a number of faces to visualize the whitespace; see
+the customization group `whitespace' for details."
   :lighter    " ws"
   :init-value nil
   :global     nil