diff --git a/StompNet/Models/StompHeaders.cs b/StompNet/Models/StompHeaders.cs
index 40479a1..82ebe2f 100644
--- a/StompNet/Models/StompHeaders.cs
+++ b/StompNet/Models/StompHeaders.cs
@@ -42,5 +42,6 @@ public static class StompHeaders
         public const string Subscription = "subscription";
         public const string Transaction = "transaction";
         public const string Version = "version";
+        public const string Expiration = "expiration";
     }
-}
\ No newline at end of file
+}