diff --git a/system/Session/Session.php b/system/Session/Session.php
index f38de5a33580..f864a09b6f19 100644
--- a/system/Session/Session.php
+++ b/system/Session/Session.php
@@ -25,6 +25,8 @@
  *
  * Session configuration is done through session variables and cookie related
  * variables in app/config/App.php
+ *
+ * @property string $session_id
  */
 class Session implements SessionInterface
 {