diff --git a/frontend/src/cart/Cart.tsx b/frontend/src/cart/Cart.tsx
index ba13145..1986b68 100644
--- a/frontend/src/cart/Cart.tsx
+++ b/frontend/src/cart/Cart.tsx
@@ -57,6 +57,7 @@ export default function Cart() {
 
   useEffect(() => { if (customer) loadAll(); }, [customer]);
 
+  // compute the total
   const total = items.reduce((sum, i) => sum + i.price_cents, 0);
 
   async function handleRemove(itemId: number) {