(mark): Doc fix.

diff --git a/lisp/simple.el b/lisp/simple.el
index c8cf33c10e4d668eabb0d28789b1dc3aca006bf4..fac25878b389cf2eb9038fbb82dbdd391fe52941 100644 (file)
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -1230,9 +1230,10 @@ START and END specify the portion of the current buffer to be copied."
        (insert-buffer-substring oldbuf start end)))))
 \f
 (defun mark (&optional force)
-  "Return this buffer's mark value as integer, or nil if no active mark now.
+  "Return this buffer's mark value as integer; error if mark inactive.
 If optional argument FORCE is non-nil, access the mark value
-even if the mark is not currently active.
+even if the mark is not currently active, and return nil
+if there is no mark at all.
 
 If you are using this in an editing command, you are most likely making
 a mistake; see the documentation of `set-mark'."