diff --git a/OPENAPI_VERSION b/OPENAPI_VERSION
index f2790682173..5ae91bffb76 100644
--- a/OPENAPI_VERSION
+++ b/OPENAPI_VERSION
@@ -1 +1 @@
-v1536
\ No newline at end of file
+v1538
\ No newline at end of file
diff --git a/src/main/java/com/stripe/model/QuotePreviewInvoice.java b/src/main/java/com/stripe/model/QuotePreviewInvoice.java
index 4882f4d149a..82ff6880994 100644
--- a/src/main/java/com/stripe/model/QuotePreviewInvoice.java
+++ b/src/main/java/com/stripe/model/QuotePreviewInvoice.java
@@ -531,6 +531,7 @@ public class QuotePreviewInvoice extends ApiResource implements HasId {
   @SerializedName("status_transitions")
   StatusTransitions statusTransitions;
 
+  /** The subscription that this invoice was prepared for, if any. */
   @SerializedName("subscription")
   @Getter(lombok.AccessLevel.NONE)
   @Setter(lombok.AccessLevel.NONE)