diff --git a/packages/types/src/documents/app/row.ts b/packages/types/src/documents/app/row.ts
index b37412398d..0b4c6cd295 100644
--- a/packages/types/src/documents/app/row.ts
+++ b/packages/types/src/documents/app/row.ts
@@ -38,6 +38,7 @@ export interface Row extends Document {
 export enum FieldSubtype {
   USER = "user",
   USERS = "users",
+  SINGLE = "single",
 }
 
 export const FieldTypeSubtypes = {
@@ -45,4 +46,7 @@ export const FieldTypeSubtypes = {
     USER: FieldSubtype.USER,
     USERS: FieldSubtype.USERS,
   },
+  ATTACHMENT: {
+    SINGLE: FieldSubtype.SINGLE,
+  },
 }