diff --git a/SlackAPI/Attachment.cs b/SlackAPI/Attachment.cs
index 06bcd1a..25ae63f 100644
--- a/SlackAPI/Attachment.cs
+++ b/SlackAPI/Attachment.cs
@@ -19,6 +19,9 @@ public class Attachment
         public string thumb_url;
         public string[] mrkdwn_in;
         public AttachmentAction[] actions;
+
+        public string footer;
+        public string footer_icon;
     }
 
     public class Field{