diff --git a/serialization.go b/serialization.go
index 7e2e96bebb..613dcdcc5a 100644
--- a/serialization.go
+++ b/serialization.go
@@ -53,5 +53,7 @@ func RlpEncode(object interface{}) string {
 }
 
 type RlpSerializer interface {
+  MarshalRls() []byte
+  UnmarshalRls([]byte)
 }