diff --git a/ts/session/utils/Attachments.ts b/ts/session/utils/Attachments.ts
index 870c92dce..bcb22e458 100644
--- a/ts/session/utils/Attachments.ts
+++ b/ts/session/utils/Attachments.ts
@@ -75,6 +75,7 @@ export class AttachmentUtils {
       size: attachment.size,
       fileName: attachment.fileName,
       flags: attachment.flags,
+      caption: attachment.caption,
     };
 
     let attachmentData: ArrayBuffer;
diff --git a/ts/types/Attachment.ts b/ts/types/Attachment.ts
index cc4a3752d..43dfcd4ba 100644
--- a/ts/types/Attachment.ts
+++ b/ts/types/Attachment.ts
@@ -250,6 +250,7 @@ export function getAlt(
 
 export type Attachment = {
   fileName?: string;
+  caption?: string;
   flags?: SignalService.AttachmentPointer.Flags;
   contentType?: MIME.MIMEType;
   size?: number;