diff --git a/Annotation/Route/RpcProducer.php b/Annotation/Route/RpcProducer.php
index 9841fba7..571da808 100644
--- a/Annotation/Route/RpcProducer.php
+++ b/Annotation/Route/RpcProducer.php
@@ -22,6 +22,9 @@ use Snowflake\Snowflake;
 
 	private string $uri = '';
 
+	const PROTOCOL_JSON = 'json';
+	const PROTOCOL_SERIALIZE = 'serialize';
+
 
 	/**
 	 * Route constructor.