diff --git a/OPENAPI_VERSION b/OPENAPI_VERSION
index fff14d8c4..af823a629 100644
--- a/OPENAPI_VERSION
+++ b/OPENAPI_VERSION
@@ -1 +1 @@
-v150
\ No newline at end of file
+v151
\ No newline at end of file
diff --git a/lib/Invoice.php b/lib/Invoice.php
index a67323623..309cc4563 100644
--- a/lib/Invoice.php
+++ b/lib/Invoice.php
@@ -48,7 +48,7 @@
  * @property null|(string|\Stripe\TaxId)[] $account_tax_ids The account tax IDs associated with the invoice. Only editable when the invoice is a draft.
  * @property int $amount_due Final amount due at this time for this invoice. If the invoice's total is smaller than the minimum charge amount, for example, or if there is account credit that can be applied to the invoice, the <code>amount_due</code> may be 0. If there is a positive <code>starting_balance</code> for the invoice (the customer owes money), the <code>amount_due</code> will also take that into account. The charge that gets generated for the invoice will be for the amount specified in <code>amount_due</code>.
  * @property int $amount_paid The amount, in %s, that was paid.
- * @property int $amount_remaining The amount remaining, in %s, that is due.
+ * @property int $amount_remaining The difference between amount_due and amount_paid, in %s.
  * @property null|string|\Stripe\StripeObject $application ID of the Connect Application that created the invoice.
  * @property null|int $application_fee_amount The fee in %s that will be applied to the invoice and transferred to the application owner's Stripe account when the invoice is paid.
  * @property int $attempt_count Number of payment attempts made for this invoice, from the perspective of the payment retry schedule. Any payment attempt counts as the first attempt, and subsequently only automatic retries increment the attempt count. In other words, manual payment attempts after the first attempt do not affect the retry schedule.
diff --git a/lib/ShippingRate.php b/lib/ShippingRate.php
index e63daf1a7..b68b757cd 100644
--- a/lib/ShippingRate.php
+++ b/lib/ShippingRate.php
@@ -8,7 +8,8 @@
  * Shipping rates describe the price of shipping presented to your customers and
  * can be applied to <a
  * href="https://stripe.com/docs/payments/checkout/shipping">Checkout Sessions</a>
- * to collect shipping costs.
+ * and <a href="https://stripe.com/docs/orders/shipping">Orders</a> to collect
+ * shipping costs.
  *
  * @property string $id Unique identifier for the object.
  * @property string $object String representing the object's type. Objects of the same type share the same value.
diff --git a/lib/Subscription.php b/lib/Subscription.php
index 1515a5830..648504130 100644
--- a/lib/Subscription.php
+++ b/lib/Subscription.php
@@ -16,7 +16,7 @@
  * @property null|string|\Stripe\StripeObject $application ID of the Connect Application that created the subscription.
  * @property null|float $application_fee_percent A non-negative decimal between 0 and 100, with at most two decimal places. This represents the percentage of the subscription invoice subtotal that will be transferred to the application owner's Stripe account.
  * @property \Stripe\StripeObject $automatic_tax
- * @property int $billing_cycle_anchor Determines the date of the first full invoice, and, for plans with <code>month</code> or <code>year</code> intervals, the day of the month for subsequent invoices.
+ * @property int $billing_cycle_anchor Determines the date of the first full invoice, and, for plans with <code>month</code> or <code>year</code> intervals, the day of the month for subsequent invoices. The timestamp is in UTC format.
  * @property null|\Stripe\StripeObject $billing_thresholds Define thresholds at which an invoice will be sent, and the subscription advanced to a new billing period
  * @property null|int $cancel_at A date in the future at which the subscription will automatically get canceled
  * @property bool $cancel_at_period_end If the subscription has been canceled with the <code>at_period_end</code> flag set to <code>true</code>, <code>cancel_at_period_end</code> on the subscription will be true. You can use this attribute to determine whether a subscription that has a status of active is scheduled to be canceled at the end of the current period.