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-rw-r--r--lisp/dired-aux.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/dired-aux.el b/lisp/dired-aux.el
index e5c2c5f3cb1..62d6928c024 100644
--- a/lisp/dired-aux.el
+++ b/lisp/dired-aux.el
@@ -2308,7 +2308,7 @@ Use \\[dired-hide-all] to (un)hide all directories."
(restore-buffer-modified-p modflag)))
;;;###autoload
-(defun dired-hide-all (ignored)
+(defun dired-hide-all (&optional ignored)
"Hide all subdirectories, leaving only their header lines.
If there is already something hidden, make everything visible again.
Use \\[dired-hide-subdir] to (un)hide a particular subdirectory."