diff --git a/blocks/calendar_month/block_calendar_month.php b/blocks/calendar_month/block_calendar_month.php
index dd5debbc8a1..24e1738c0ea 100644
--- a/blocks/calendar_month/block_calendar_month.php
+++ b/blocks/calendar_month/block_calendar_month.php
@@ -60,6 +60,7 @@ class block_calendar_month extends block_base {
             $this->content->text .= calendar_overlib_html();
             $this->content->text .= calendar_top_controls('course', array('id' => $courseshown, 'm' => $cal_m, 'y' => $cal_y));
             $this->content->text .= calendar_get_mini($courses, $group, $user, $cal_m, $cal_y);
+            $this->content->text .= '<h3 class="eventskey">'.get_string('eventskey', 'calendar').'</h3>';
             $this->content->text .= '<div class="filters">'.calendar_filter_controls('course', '', $COURSE).'</div>';
             
         }