diff --git a/dial.go b/dial.go
index 763096d..a1cb75d 100644
--- a/dial.go
+++ b/dial.go
@@ -8,6 +8,7 @@ import (
 type Dialer struct {
 	Timeout   time.Duration
 	Deadline  time.Time
+	DualStack bool
 	KeepAlive time.Duration
 }