diff --git a/types/chart.js/index.d.ts b/types/chart.js/index.d.ts
index 03d3b988ce..338e38e223 100644
--- a/types/chart.js/index.d.ts
+++ b/types/chart.js/index.d.ts
@@ -162,6 +162,7 @@ declare namespace Chart {
     interface ChartPoint {
         x?: number | string | Date;
         y?: number;
+        r?: number;
     }
 
     interface ChartConfiguration {