diff --git a/src/domain/report.ts b/src/domain/report.ts
index 2534463..1bb0a90 100644
--- a/src/domain/report.ts
+++ b/src/domain/report.ts
@@ -1,5 +1,6 @@
 import type { Booking } from './booking.ts';
 import type { Court } from './court.ts';
+import { busiestHour } from './busiest-hour.ts';
 
 export type CourtSummary = {
   courtId: number;
@@ -14,6 +15,7 @@ export type DailySummary = {
   bookings: number;
   hours: number;
   revenueCents: number;
+  busiestHour: number | null;
   courts: CourtSummary[];
 };
 
@@ -37,6 +39,7 @@ export function dailySummary(date: string, courts: Court[], bookings: Booking[])
     bookings: sum(perCourt.map((c) => c.bookings)),
     hours: sum(perCourt.map((c) => c.hours)),
     revenueCents: sum(perCourt.map((c) => c.revenueCents)),
+    busiestHour: busiestHour(confirmed),
     courts: perCourt,
   };
 }