diff --git a/packages/agent-app-sdk/README.md b/packages/agent-app-sdk/README.md
index a4008a4..dd15b8e 100644
--- a/packages/agent-app-sdk/README.md
+++ b/packages/agent-app-sdk/README.md
@@ -148,6 +148,7 @@ This event is triggered when a customer selects a different billing cycle for a
 ```ts
 type UpdateBillingCycleEvent {
   billingCycle: number,
+  chargeId: string,
   paymentIntent: {
     name: string,
     price: number,