diff --git a/lib/PaymentIntent.php b/lib/PaymentIntent.php
index b5d507ea8..514774f5f 100644
--- a/lib/PaymentIntent.php
+++ b/lib/PaymentIntent.php
@@ -22,6 +22,7 @@
  * @property string $currency
  * @property string $customer
  * @property string $description
+ * @property string $invoice
  * @property mixed $last_payment_error
  * @property bool $livemode
  * @property StripeObject $metadata