note subscriptions not deleted from database in readme

README.md

@@ -113,7 +113,10 @@ polar.registerRoutes(http, {
   path: "/events/polar",
   // Optional callbacks for webhook events
   onSubscriptionUpdated: async (ctx, event) => {
-    // Handle subscription updates, like cancellations
+    // Handle subscription updates, like cancellations.
+    // Note that a cancelled subscription will not be deleted from the database,
+    // so this information remains available without a hook, eg., via
+    // `getCurrentSubscription()`.
     if (event.data.customerCancellationReason) {
       console.log("Customer cancelled:", event.data.customerCancellationReason);
     }