argument for `C-c C-k' (bug#7391).
2011-07-02 Lars Magne Ingebrigtsen <larsi@gnus.org>
+ * picture-xtra.texi (Rectangles in Picture): Clarify the prefix
+ argument for `C-c C-k' (bug#7391).
+
* frames.texi (Fonts): Mention "C-u C-x =" to find out what font
you're currently using (bug#8489).
@table @kbd
@item C-c C-k
Clear out the region-rectangle with spaces
-(@code{picture-clear-rectangle}). With argument, delete the text.
+(@code{picture-clear-rectangle}). With a prefix argument, delete the
+text.
@item C-c C-w @var{r}
Similar, but save rectangle contents in register @var{r} first
(@code{picture-clear-rectangle-to-register}).