--- rxvt-unicode/src/urxvt.pm	2008/10/10 00:11:44	1.171
+++ rxvt-unicode/src/urxvt.pm	2008/10/10 00:21:15	1.172
@@ -1388,12 +1388,14 @@
 
 =over 4
 
-=item $overlay->set ($x, $y, $text, $rend)
+=item $overlay->set ($x, $y, $text[, $rend])
 
 Similar to C<< $term->ROW_t >> and C<< $term->ROW_r >> in that it puts
 text in rxvt-unicode's special encoding and an array of rendition values
 at a specific position inside the overlay.
 
+If C<$rend> is missing, then the rendition will not be changed.
+
 =item $overlay->hide
 
 If visible, hide the overlay, but do not destroy it.