diff --git a/src/methods.ts b/src/methods.ts
index fddcc8ab5..43297fd6d 100644
--- a/src/methods.ts
+++ b/src/methods.ts
@@ -91,6 +91,8 @@ export interface MessageAttachment {
     type: string;
     text?: string;
   }[];
+  callback_id?: string;
+  mrkdwn_in?: ('pretext' | 'text' | 'fields')[];
 }
 
 export interface LinkUnfurls {