diff --git a/includes/unix-graphing.php b/includes/unix-graphing.php
index 9a48f7279e..2808f4954c 100755
--- a/includes/unix-graphing.php
+++ b/includes/unix-graphing.php
@@ -1,5 +1,8 @@
 <?php 
 
+## FIXME not used, do we still need this?
+## included from includes/unix.php, which is also unused
+
 function mailerrorgraphUnix ($rrd, $graph, $from, $to, $width, $height, $title, $vertical) {
   global $config, $installdir;
   $database = $config['rrd_dir'] . "/" . $rrd;