--- rxvt-unicode/src/perl/background	2021/07/24 11:58:27	1.101
+++ rxvt-unicode/src/perl/background	2021/09/16 20:23:19	1.102
@@ -1324,7 +1324,7 @@
    $arg_self->{next_refresh} = urxvt::NOW + $MIN_INTERVAL;
 
    unless ($arg_self->has_render) {
-      warn "background extension needs RENDER extension 0.10 or higher, ignoring background-expr.\n";
+      warn "background extension needs RENDER extension 0.11 or higher, ignoring background-expr.\n";
       return;
    }