diff --git a/bot/ingame.go b/bot/ingame.go
index 9c2f891..d5be99d 100644
--- a/bot/ingame.go
+++ b/bot/ingame.go
@@ -5,6 +5,7 @@ import (
 	"errors"
 	"io"
 	"io/ioutil"
+
 	// "math"
 	// "time"
 	"fmt"
@@ -123,6 +124,7 @@ func (c *Client) handlePacket(p pk.Packet) (disconnect bool, err error) {
 	case data.NamedSoundEffect:
 		err = handleNamedSoundEffect(c, p)
 	default:
+		
 		// fmt.Printf("ignore pack id %X\n", p.ID)
 	}
 	return
diff --git a/cmd/daze/daze.go b/cmd/daze/daze.go
index 289ad87..da23faa 100644
--- a/cmd/daze/daze.go
+++ b/cmd/daze/daze.go
@@ -1,10 +1,11 @@
 package main
 
 import (
-	// "github.com/Tnze/go-mc/authenticate"
+	"log"
+
 	"github.com/Tnze/go-mc/bot"
 	"github.com/Tnze/go-mc/chat"
-	"log"
+	// "github.com/Tnze/go-mc/authenticate"
 )
 
 func main() {
diff --git a/cmd/ping/ping.go b/cmd/ping/ping.go
index 4e5977c..11f45a4 100644
--- a/cmd/ping/ping.go
+++ b/cmd/ping/ping.go
@@ -1,12 +1,18 @@
 package main
 
 import (
-	"github.com/Tnze/go-mc/bot"
 	"log"
+	"os"
+
+	"github.com/Tnze/go-mc/bot"
 )
 
 func main() {
-	resp, delay, err := bot.PingAndList("play.miaoscraft.cn", 25565)
+	if len(os.Args) < 2 {
+		log.Fatalln("no host name. Useage: ping [hostname]")
+	}
+
+	resp, delay, err := bot.PingAndList(os.Args[1], 25565)
 	if err != nil {
 		log.Fatalf("ping and list server fail: %v", err)
 	}