diff --git a/OPENAPI_VERSION b/OPENAPI_VERSION
index ae46fe520..35e0f7638 100644
--- a/OPENAPI_VERSION
+++ b/OPENAPI_VERSION
@@ -1 +1 @@
-v1272
\ No newline at end of file
+v1273
\ No newline at end of file
diff --git a/lib/UsageRecordSummary.php b/lib/UsageRecordSummary.php
index 174e14e03..d9a983928 100644
--- a/lib/UsageRecordSummary.php
+++ b/lib/UsageRecordSummary.php
@@ -5,6 +5,8 @@
 namespace Stripe;
 
 /**
+ * A usage record summary represents an aggregated view of how much usage was accrued for a subscription item within a subscription billing period.
+ *
  * @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.
  * @property null|string $invoice The invoice in which this usage period has been billed for.