diff --git a/lib/Checkout/Session.php b/lib/Checkout/Session.php
index 968d58cf6..a6b3278ac 100644
--- a/lib/Checkout/Session.php
+++ b/lib/Checkout/Session.php
@@ -15,6 +15,7 @@
  * @property bool $livemode
  * @property string $payment_intent
  * @property string[] $payment_method_types
+ * @property string $submit_type
  * @property string $subscription
  * @property string $success_url
  *