diff --git a/src/api/model/message.ts b/src/api/model/message.ts
index 6840b17b0..b25f315f6 100644
--- a/src/api/model/message.ts
+++ b/src/api/model/message.ts
@@ -111,6 +111,8 @@ export interface Message {
   quotedMsgId: null;
   mediaData: MediaData;
   recipients?: string[];
+  /** exists for image and video types {@link GroupNotificationType} */
+  caption?: string;
 }
 
 export interface MediaData {