1 files changed, 2 insertions, 2 deletions

diff --git a/lisp/format.el b/lisp/format.el
index aeadb68d60f..90047e98a6c 100644
--- a/lisp/format.el
+++ b/lisp/format.el
@@ -1,6 +1,6 @@
 ;;; format.el --- read and save files in multiple formats
 
-;; Copyright (c) 1994, 1995, 1997, 1999 Free Software Foundation
+;; Copyright (c) 1994, 1995, 1997, 1999, 2004 Free Software Foundation
 
 ;; Author: Boris Goldowsky <boris@gnu.org>
 
@@ -287,7 +287,7 @@ For most purposes, consider using `format-decode-region' instead."
             (let ((do format) f)
               (while do
                 (or (setq f (assq (car do) format-alist))
-                    (error "Unknown format" (car do)))
+                    (error "Unknown format %s" (car do)))
                 ;; Decode:
                 (if (nth 3 f)
                     (setq end (format-decode-run-method (nth 3 f) begin end)))