diff --git a/lib.php b/lib.php
index 01b24ff..aed8be8 100644
--- a/lib.php
+++ b/lib.php
@@ -40,6 +40,7 @@ function opencast_supports($feature) {
         case FEATURE_MOD_INTRO:
         case FEATURE_SHOW_DESCRIPTION:
         case FEATURE_BACKUP_MOODLE2:
+        case FEATURE_COMPLETION_TRACKS_VIEWS:
             return true;
         default:
             return null;
diff --git a/view.php b/view.php
index c33a8a7..141d5f3 100644
--- a/view.php
+++ b/view.php
@@ -29,6 +29,7 @@
 require_once(__DIR__ . '/lib.php');
 require_once($CFG->dirroot . '/course/modlib.php');
 require_once($CFG->libdir . '/gradelib.php');
+require_once($CFG->libdir.'/completionlib.php');
 
 global $OUTPUT, $DB, $PAGE;
 
@@ -86,6 +87,10 @@
 $event->add_record_snapshot('opencast', $moduleinstance);
 $event->trigger();
 
+// Completion.
+$completion = new completion_info($course);
+$completion->set_module_viewed($cm);
+
 if ($moduleinstance->type == opencasttype::EPISODE) {
     output_helper::output_episode($moduleinstance->ocinstanceid, $moduleinstance->opencastid, $moduleinstance->id);
 } else if ($moduleinstance->type == opencasttype::SERIES) {