diff --git a/createsend-dotnet/Transactional/MessageListDetail.cs b/createsend-dotnet/Transactional/MessageListDetail.cs
index bff5a68..d23a592 100644
--- a/createsend-dotnet/Transactional/MessageListDetail.cs
+++ b/createsend-dotnet/Transactional/MessageListDetail.cs
@@ -14,5 +14,6 @@ public class MessageListDetail
         public long TotalOpens { get; set; }
         public long TotalClicks { get; set; }
         public bool CanBeResent { get; set; }
+        public DateTimeOffset SentAt { get; set; }
     }
 }