diff --git a/nns/nns_contract.go b/nns/nns_contract.go
index 0c9f9a4..54a8e34 100644
--- a/nns/nns_contract.go
+++ b/nns/nns_contract.go
@@ -76,14 +76,15 @@ type RecordState struct {
 }
 
 // Update updates NameService contract.
-func Update(nef []byte, manifest string) {
+func Update(nef []byte, manifest string, data interface{}) {
 	checkCommittee()
 	// Calculating keys and serializing requires calling
 	// std and crypto contracts. This can be helpful on update
 	// thus we provide `AllowCall` to management.Update.
 	// management.Update(nef, []byte(manifest))
 	contract.Call(interop.Hash160(management.Hash), "update",
-		contract.All, nef, manifest, common.AppendVersion(nil))
+		contract.All, nef, manifest, common.AppendVersion(data))
+	runtime.Log("nns contract updated")
 }
 
 // _deploy initializes defaults (total supply and registration price) on contract deploy.