(yank-excluded-properties): Expand documentation string.

diff --git a/lisp/simple.el b/lisp/simple.el
index 6a382d8c5503a0a3ca4b9dda9a1a24a2290e0540..3cabbae2d76b56d2e49bc58262bece9a09b4ae2d 100644 (file)
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -2006,7 +2006,9 @@ The argument is used for internal purposes; do not supply one."
 (defcustom yank-excluded-properties
   '(read-only invisible intangible field mouse-face help-echo local-map keymap
     yank-handler)
-  "*Text properties to discard when yanking."
+  "*Text properties to discard when yanking.
+The value should be a list of text properties to discard or t,
+which means to discard all text properties."
   :type '(choice (const :tag "All" t) (repeat symbol))
   :group 'editing
   :version "21.4")