(dired-up-directory): Doc fix (bug#14848).

lisp/ChangeLog

@@ -2,6 +2,7 @@
 
 	* dired.el (dired-mode-map): Make :help text more accurate (bug#14893).
 	(dired-prev-marked-file): Doc fix (bug#14855).
+	(dired-up-directory): Doc fix (bug#14848).
 
 	* minibuffer.el (read-file-name): Doc clarification (bug#15096).
 

lisp/dired.el

@@ -2045,7 +2045,9 @@ Optional prefix ARG says how many lines to move; default is one line."
 (defun dired-up-directory (&optional other-window)
   "Run Dired on parent directory of current directory.
 Find the parent directory either in this buffer or another buffer.
-Creates a buffer if necessary."
+Creates a buffer if necessary.
+If OTHER-WINDOW (the optional prefix arg), display the parent
+directory in another window."
   (interactive "P")
   (let* ((dir (dired-current-directory))
 	 (up (file-name-directory (directory-file-name dir))))