diff --git a/src/resources/messages/interfaces.ts b/src/resources/messages/interfaces.ts
index 3aa92c2..a8fc843 100644
--- a/src/resources/messages/interfaces.ts
+++ b/src/resources/messages/interfaces.ts
@@ -43,6 +43,7 @@ export interface ListMessagesOptions extends PaginationOptions {
   status?: MessageStatus[];
   channel_id?: string;
   trigger_data?: Record<string, any>;
+  workflow_categories?: String[];
 }
 
 export interface ListMessageActivitiesOptions extends PaginationOptions {