diff --git a/module/VuFind/src/VuFind/Controller/Plugin/Followup.php b/module/VuFind/src/VuFind/Controller/Plugin/Followup.php
index d2d79771b12a9f7b1188b45d134bc1d6b24a7e8b..d3fbc652bf26126180c9065c5c813cbdbce2745f 100644
--- a/module/VuFind/src/VuFind/Controller/Plugin/Followup.php
+++ b/module/VuFind/src/VuFind/Controller/Plugin/Followup.php
@@ -40,6 +40,11 @@ use Zend\Mvc\Controller\Plugin\AbstractPlugin, Zend\Session\Container;
  */
 class Followup extends AbstractPlugin
 {
+    /**
+     * Session container
+     *
+     * @var Container
+     */
     protected $session;
 
     /**