diff --git a/module/VuFind/src/VuFind/Theme/Root/Helper/AbstractServiceLocator.php b/module/VuFind/src/VuFind/Theme/Root/Helper/AbstractServiceLocator.php
index da81af015a405773cc829d57abfac1f72a3afc48..aafa5012f949de76cfe470590cffd908760643d7 100644
--- a/module/VuFind/src/VuFind/Theme/Root/Helper/AbstractServiceLocator.php
+++ b/module/VuFind/src/VuFind/Theme/Root/Helper/AbstractServiceLocator.php
@@ -42,6 +42,11 @@ use Zend\ServiceManager\ServiceLocatorInterface,
 abstract class AbstractServiceLocator extends AbstractHelper
     implements ServiceLocatorAwareInterface
 {
+    /**
+     * Service locator
+     *
+     * @var ServiceLocatorInterface
+     */
     protected $serviceLocator;
 
     /**