* dired-aux.el (dired-kill-line): Add a doc string.

Fixes: debbugs:957

lisp/ChangeLog

 2011-07-06  Lars Magne Ingebrigtsen  <larsi@gnus.org>
 
+	* dired-aux.el (dired-kill-line): Add a doc string.
+
 	* dabbrev.el (dabbrev-abbrev-char-regexp): Note that nil defaults
 	to "\\sw\\|\\s_" (bug#358).
 

lisp/dired-aux.el

@@ -699,6 +699,9 @@ can be produced by `dired-get-marked-files', for example."
 ;; Commands that delete or redisplay part of the dired buffer.
 
 (defun dired-kill-line (&optional arg)
+  "Kill the current line (not the files).
+With a prefix argument, kill that many lines starting with the current line.
+\(A negative argument kills backward.)"
   (interactive "P")
   (setq arg (prefix-numeric-value arg))
   (let (buffer-read-only file)