diff --git a/family/type.go b/family/type.go
index d3c32e8..1c7ea34 100644
--- a/family/type.go
+++ b/family/type.go
@@ -10,10 +10,11 @@ const (
 	INET
 	ARP
 	BRIDGE
+	NETDEV
 )
 
-func (f Type) String() string {
-	switch f {
+func (t Type) String() string {
+	switch t {
 	case IP:
 		return "ip"
 	case IP6:
@@ -24,7 +25,9 @@ func (f Type) String() string {
 		return "arp"
 	case BRIDGE:
 		return "bridge"
+	case NETDEV:
+		return "netdev"
 	default:
-		return fmt.Sprintf("Encoding(%d)", f)
+		return fmt.Sprintf("unknown family %d", t)
 	}
 }