diff --git a/cmd/add.go b/cmd/add.go
index 0b08793..7954a8f 100644
--- a/cmd/add.go
+++ b/cmd/add.go
@@ -15,24 +15,24 @@ var addLocalIP net.IP
 var addRemoteIP net.IP
 var addLinkName string
 
-var addCmd = &cobra.Command{
+var AddCmd = &cobra.Command{
 	Use:   "add",
 	Short: "Ethernet over IPv6(RFC3378)カーネルのクライアント",
-	RunE: runE,
+	RunE: AddrunE,
 }
 
-func runE(cmd *cobra.Command, args []string) error {
+func AddrunE(cmd *cobra.Command, args []string) error {
 	err := utils.AddDev(addDevName, addLocalIP, addRemoteIP, addLinkName)
 	return err
 }
 
 func init() {
-	addCmd.Flags().StringVarP(&addDevName, "devname", "d", "eip0", "作成するNICの名")
-	addCmd.Flags().IPVarP(&addLocalIP, "local", "l", nil, "自分の終端アドレス")
-	addCmd.Flags().IPVarP(&addRemoteIP, "remote", "r", nil, "相手の終端アドレス")
-	addCmd.Flags().StringVarP(&addLinkName, "link", "L", "", "アンダーレイのNIC名")
+	AddCmd.Flags().StringVarP(&addDevName, "devname", "d", "eip0", "作成するNICの名")
+	AddCmd.Flags().IPVarP(&addLocalIP, "local", "l", nil, "自分の終端アドレス")
+	AddCmd.Flags().IPVarP(&addRemoteIP, "remote", "r", nil, "相手の終端アドレス")
+	AddCmd.Flags().StringVarP(&addLinkName, "link", "L", "", "アンダーレイのNIC名")
 
-	rootCmd.AddCommand(addCmd)
+	rootCmd.AddCommand(AddCmd)
 }
 
 
diff --git a/cmd/delete.go b/cmd/delete.go
new file mode 100644
index 0000000..43f8678
--- /dev/null
+++ b/cmd/delete.go
@@ -0,0 +1,25 @@
+/*
+Copyright © 2026 Masato Kikuchi <m-kikuchi@neody.ad.jp>
+*/
+package cmd
+
+import (
+	"git.neody.ad.jp/tuna2134/etherip-client/utils"
+	"github.com/spf13/cobra"
+)
+
+var DelDevVar string
+
+var deleteCmd = &cobra.Command{
+	Use:   "delete",
+	Short: "Delete iface",
+	Long: `Delete iface`,
+	RunE: func(cmd *cobra.Command, args []string) error {
+		return utils.DelDev(DelDevVar)
+	},
+}
+
+func init() {
+	deleteCmd.Flags().StringVarP(&DelDevVar, "devname", "d", "eip0", "削除対象のNICの名前")
+	rootCmd.AddCommand(deleteCmd)
+}
diff --git a/cmd/root.go b/cmd/root.go
index 00b39db..6a874ea 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -1,16 +1,21 @@
 /*
 Copyright © 2026 Masato Kikuchi <m-kikuchi@neody.ad.jp>
+
 */
 package cmd
 
 import (
 	"os"
+
 	"github.com/spf13/cobra"
 )
 
+
+
 var rootCmd = &cobra.Command{
 	Use:   "etherip-client",
-	Short: "Ethernet over IPv6(RFC3378)カーネルのクライアント",
+	Short: "EtherIP RFC3378 Client",
+	Long: `Ethernet over IPv6`,
 }
 
 func Execute() {
diff --git a/main.go b/main.go
index 7843e5d..364a287 100644
--- a/main.go
+++ b/main.go
@@ -1,5 +1,5 @@
 /*
-Copyright © 2026 Masato Kikuchi <m-kikuchi@neody.ad.jp>
+Copyright © 2026 NAME HERE <EMAIL ADDRESS>
 */
 package main
 
diff --git a/utils/delDev.go b/utils/delDev.go
new file mode 100644
index 0000000..3365dc9
--- /dev/null
+++ b/utils/delDev.go
@@ -0,0 +1,12 @@
+package utils
+
+import "github.com/vishvananda/netlink"
+
+func DelDev(devname string) error {
+	link, err := netlink.LinkByName(devname)
+	if err != nil {
+		return err
+	}
+	netlink.LinkDel(link)
+	return nil
+}
\ No newline at end of file