diff --git a/docs/TASKS_TO_COMPLETE.md b/docs/TASKS_TO_COMPLETE.md
index e3fa5e8d..1259c951 100644
--- a/docs/TASKS_TO_COMPLETE.md
+++ b/docs/TASKS_TO_COMPLETE.md
@@ -29,9 +29,9 @@
   - Acceptance criteria: endpoint returns per-factor contributions; UI shows them; degrade if absent.
   - Verification command: `pnpm --filter @lysnrai/platform-service exec vitest run src/modules/fleet`
 
-- [ ] **Cost burndown chart**
+- [x] **Cost burndown chart**
   - Priority: P1
-  - Current status: budget page shows a spend bar only
+  - Current status: ✅ DONE — `costBurndown` + `GET /fleet/budgets/:id/burndown` + BurndownChart; fleet 147 green
   - Files involved: `dashboards/tracker-web/src/app/dashboard/fleet/budget/page.tsx`, new client fn
   - Implementation plan: aggregate run cost by day from events/runs; render burndown vs ceiling overlay.
   - Acceptance criteria: per-day spend visible with ceiling line; empty state when no data.