diff --git a/packages/esign/src/types.ts b/packages/esign/src/types.ts
index baa7914ec2..b49e1cbfb3 100644
--- a/packages/esign/src/types.ts
+++ b/packages/esign/src/types.ts
@@ -3,6 +3,7 @@ import type { SuperDoc } from 'superdoc'; // eslint-disable-line
 /** Value types for esign fields */
 export type FieldValue = string | boolean | number | null | undefined;
 
+/** Base interface for field identification */
 export interface FieldReference {
   id: string;
 }