diff --git a/tests/test_framework/phpbb_session_test_case.php b/tests/test_framework/phpbb_session_test_case.php
index d4fc174a12..efad4d5166 100644
--- a/tests/test_framework/phpbb_session_test_case.php
+++ b/tests/test_framework/phpbb_session_test_case.php
@@ -16,8 +16,13 @@ require_once dirname(__FILE__) . '/../session/testable_facade.php';
 
 abstract class phpbb_session_test_case extends phpbb_database_test_case
 {
+	/** @var phpbb_session_testable_factory */
 	protected $session_factory;
+
+	/** @var phpbb_session_testable_facade */
 	protected $session_facade;
+
+	/** @var \phpbb\db\driver\driver_interface */
 	protected $db;
 
 	function setUp()