diff --git a/cmd/login.go b/cmd/login.go
index 24a3ca4..16502c7 100644
--- a/cmd/login.go
+++ b/cmd/login.go
@@ -20,9 +20,9 @@ var loginWithToken bool
 func initLogin() {
 	rootCmd.AddCommand(loginCommand)
 
+	// 	hostSSHCmd.PersistentFlags().StringVarP(&sshFlags.IdentityFile,
+	//	"identity_file", "i", "~/.adb/id_rsa", "identity file")
 	loginCommand.PersistentFlags().BoolVarP(&loginWithToken, "token", "t", false, "login with token")
-
-	// 	hostSSHCmd.PersistentFlags().StringVarP(&sshFlags.IdentityFile, "identity_file", "i", "~/.adb/id_rsa", "identity file")
 }
 
 func login() {
diff --git a/cmd/service.go b/cmd/service.go
index 40b90c4..7992fc4 100644
--- a/cmd/service.go
+++ b/cmd/service.go
@@ -18,6 +18,8 @@ package cmd
 import (
 	"fmt"
 
+	"github.com/airdb/adb/internal/adblib"
+
 	"github.com/airdb/sailor"
 	"github.com/aliyun/alibaba-cloud-sdk-go/services/alidns"
 	"github.com/spf13/cobra"
@@ -74,10 +76,11 @@ func service() {
 var servicesAddCmdMinArgs = 2
 
 var servicesAddCmd = &cobra.Command{
-	Use:   "add [service] [SRV record value]",
-	Short: "Add service",
-	Long:  "Add service",
-	Args:  cobra.MinimumNArgs(servicesAddCmdMinArgs),
+	Use:     "add [service] [SRV record value]",
+	Short:   "Add service",
+	Long:    "Add service",
+	Example: adblib.DNSSrvDoc,
+	Args:    cobra.MinimumNArgs(servicesAddCmdMinArgs),
 	Run: func(cmd *cobra.Command, args []string) {
 		addService(args)
 	},
diff --git a/go.sum b/go.sum
index 68b3a00..7350b3c 100644
--- a/go.sum
+++ b/go.sum
@@ -16,8 +16,6 @@ github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWX
 github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
 github.com/airdb/sailor v1.1.2-0.20200802151610-a033b3f2a246 h1:5URmvEzDlQ5RoyiyUvrX5Ao5F7nlycdbUKoGuiVecjA=
 github.com/airdb/sailor v1.1.2-0.20200802151610-a033b3f2a246/go.mod h1:Txr7LHYpg61npbaDGkfud/lRaOFEaAB1f0anzuglOmI=
-github.com/airdb/sailor v1.4.0-85dfa77 h1:ieXE0OhZKknCUZU3vi2bcYoWLt3BAiFDKosBTHH35pI=
-github.com/airdb/sailor v1.4.0-85dfa77/go.mod h1:Txr7LHYpg61npbaDGkfud/lRaOFEaAB1f0anzuglOmI=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/aliyun/alibaba-cloud-sdk-go v1.61.279 h1:y/fx2Tc2JCJ92exFGxtytxUOJfInHCNLuk/7Bbmbgz0=
diff --git a/internal/adblib/dns.go b/internal/adblib/dns.go
new file mode 100644
index 0000000..8cab746
--- /dev/null
+++ b/internal/adblib/dns.go
@@ -0,0 +1,16 @@
+package adblib
+
+import (
+	"github.com/MakeNowJust/heredoc"
+)
+
+var (
+	DNSSrvDoc = heredoc.Doc(`
+$ adb srv add _sip._tcp "10 60 443 bigbox.airdb.red"
+$ adb srv add _sip._tcp "10 20 443 smallbox1.airdb.blue"
+$ adb srv add _sip._tcp "10 20 443 smallbox2.airdb.green"
+$ adb srv add _sip._tcp "20 0  443 backup.airdb.black"
+
+> Refer: https://zh.wikipedia.org/wiki/SRV记录
+	`)
+)
diff --git a/internal/adblib/login.go b/internal/adblib/login.go
index 0f0990d..bd916bf 100644
--- a/internal/adblib/login.go
+++ b/internal/adblib/login.go
@@ -22,8 +22,10 @@ func LoginWithToken() {
 
 	bar.NewOption(0, 100)
 
+	var sleepInterval time.Duration = 100
+
 	for i := 0; i <= 100; i++ {
-		time.Sleep(100 * time.Millisecond)
+		time.Sleep(sleepInterval * time.Millisecond)
 		bar.Play(int64(i))
 	}
 
diff --git a/internal/adblib/man.go b/internal/adblib/man.go
index ef04dea..47a1510 100644
--- a/internal/adblib/man.go
+++ b/internal/adblib/man.go
@@ -109,6 +109,14 @@ $ Github or Git Command:
 		brew install github/gh/gh
 		gh --repo bbhj/lbs issue status
 		gh --repo bbhj/lbs issue view 1
+
+	5. Delete branch or tag
+		git branch -D dev
+		git push origin --delete dev
+
+		git tag -d v1.0
+		git push --delete origin v1.0
+
 `)
 
 	OpenSSLDoc = heredoc.Doc(`
diff --git a/internal/adblib/token.go b/internal/adblib/token.go
index d289547..521d4aa 100644
--- a/internal/adblib/token.go
+++ b/internal/adblib/token.go
@@ -5,7 +5,6 @@ import (
 )
 
 var TokenRequest = heredoc.Doc(`
-https://sfc.baobeihuijia.com/release/oauth2/token?request_id=f572d396fae9206628714fb2ce00f72e94f2258f
+https://scf.baobeihuijia.com/release/oauth2/token?request_id=f572d396fae9206628714fb2ce00f72e94f2258f
 please login with Github, and wait for 30s after you login.
 `)
-