diff --git a/dnstun.go b/dnstun.go
index 08239fa..4cfc1c8 100644
--- a/dnstun.go
+++ b/dnstun.go
@@ -118,5 +118,7 @@ func getDomain(p []byte) []byte {
 		i = i + l + 1
 	}
 
-	return ret
+	// TODO: check here
+	// domain name could not be null, so the length of ret always >= 1?
+	return ret[:len(ret)-1]
 }
diff --git a/main.go b/main.go
index 8e17b77..5213c82 100644
--- a/main.go
+++ b/main.go
@@ -12,7 +12,7 @@ import (
 )
 
 // VERSION .
-const VERSION = "0.3.1"
+const VERSION = "0.4.0"
 
 var conf struct {
 	Verbose       bool
diff --git a/proxy.go b/proxy.go
index 1111831..86e7dd2 100644
--- a/proxy.go
+++ b/proxy.go
@@ -24,7 +24,7 @@ type Proxy interface {
 	// Get current proxy
 	CurrentProxy() Proxy
 
-	// Get a proxy according to the strategy
+	// Get a proxy based on the destAddr and strategy
 	GetProxy(dstAddr string) Proxy
 
 	// Switch to the next proxy
diff --git a/redir_other.go b/redir_other.go
index 7b68eea..ce591c4 100644
--- a/redir_other.go
+++ b/redir_other.go
@@ -4,14 +4,14 @@ package main
 
 import "log"
 
-type redir struct{ Proxy }
+type redir struct{ *proxy }
 
 // RedirProxy returns a redirect proxy.
 func RedirProxy(addr string, upProxy Proxy) (Proxy, error) {
-	return &redir{Proxy: upProxy}, nil
+	return &redir{proxy: newProxy(addr, upProxy)}, nil
 }
 
 // ListenAndServe redirected requests as a server.
 func (s *redir) ListenAndServe() {
-	log.Fatal("redir not supported on windows")
+	log.Fatal("redir not supported on this os")
 }