diff --git a/src/element/types.ts b/src/element/types.ts
index e8d71cae5..1a6fcf482 100644
--- a/src/element/types.ts
+++ b/src/element/types.ts
@@ -65,6 +65,7 @@ type _ExcalidrawElementBase = Readonly<{
   updated: number;
   link: string | null;
   locked: boolean;
+  subtype?: string;
   customData?: Record<string, any>;
 }>;