diff --git a/types/react-tagsinput/index.d.ts b/types/react-tagsinput/index.d.ts
index 1030c5ff277adf..5097ca340bb962 100644
--- a/types/react-tagsinput/index.d.ts
+++ b/types/react-tagsinput/index.d.ts
@@ -32,6 +32,7 @@ declare namespace TagsInput {
         readonly getTagDisplayValue: (tag: Tag) => string;
         readonly onRemove: (tagIndex: number) => void;
         readonly tag: Tag;
+        readonly key: string | number;
     }
 
     type RenderLayout = (tagElements: React.ReactElement[], inputElement: React.ReactElement) => React.ReactChild;