diff --git a/index.d.ts b/index.d.ts
index 97243f0d2..cbaef12a6 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -970,6 +970,7 @@ declare namespace Eris {
   }
   interface Attachment {
     content_type?: string;
+    ephemeral?: boolean;
     filename: string;
     height?: number;
     id: string;