diff --git a/plugins/cost-insights/src/client.ts b/plugins/cost-insights/src/client.ts
index c78a3dc2dc..96e9025f5d 100644
--- a/plugins/cost-insights/src/client.ts
+++ b/plugins/cost-insights/src/client.ts
@@ -140,6 +140,8 @@ export class ExampleCostInsightsClient implements CostInsightsApi {
         aggregation: aggregation,
         change: changeOf(aggregation),
         trendline: trendlineOf(aggregation),
+        // Optional field on Cost which needs to be supplied in order to see
+        // the product breakdown view in the top panel.
         groupedCosts: getGroupedProducts(intervals),
       },
     );
@@ -156,6 +158,8 @@ export class ExampleCostInsightsClient implements CostInsightsApi {
         aggregation: aggregation,
         change: changeOf(aggregation),
         trendline: trendlineOf(aggregation),
+        // Optional field on Cost which needs to be supplied in order to see
+        // the product breakdown view in the top panel.
         groupedCosts: getGroupedProducts(intervals),
       },
     );