diff --git a/cal/cal.php b/cal/cal.php
index fb5ae482..461cb020 100644
--- a/cal/cal.php
+++ b/cal/cal.php
@@ -167,10 +167,11 @@ function cal_addon_settings ( &$a, &$s  )
 
     $enabled = get_pconfig(local_user(), 'cal', 'enable');
     $checked = (($enabled) ? ' checked="checked" ' : '');
-    $url = $a->get_baseurl().'/cal/'.$a->user['nickname'].'/export/ical';
+    $url = $a->get_baseurl().'/cal/'.$a->user['nickname'].'/export/<em>format</em>';
 
     $s .= '<h3>'.t('Export Events').'</h3>';
     $s .= '<p>'.t('If this is enabled, you public events will be available at').' <strong>'.$url.'</strong></p>';
+    $s .= '<p>'.t('Currently supported formats are ical and csv.').'</p>';
     $s .= '<div id="cal-enable-wrapper">';
     $s .= '<label id="cal-enable-label" for="cal-checkbox">'. t('Enable calendar export') .'</label>';
     $s .= '<input id="cal-checkbox" type="checkbox" name="cal-enable" value="1" ' . $checked . '/>';