diff --git a/react-notification-system/react-notification-system.d.ts b/react-notification-system/react-notification-system.d.ts
index 4f51314680..31b151662a 100644
--- a/react-notification-system/react-notification-system.d.ts
+++ b/react-notification-system/react-notification-system.d.ts
@@ -74,6 +74,7 @@ declare namespace NotificationSystem {
         noAnimation?: boolean;
         ref?: string;
         style?: Style | boolean;
+        allowHTML?: boolean;
     }
 }