diff --git a/README.md b/README.md
index bbb9ae1..ce09a7e 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,9 @@
 # terminal_note
-`terminal_note` is a terminal notebook app, in which you can record some notes in your terminal and set password for it.
+`terminal_note` is a terminal notebook app with password, in which you can record some notes in your terminal.
 
 ## Install
 ```go
-$ cd $GOPATH && git clone https://github.com/JemmyH/terminal_note.git
+$ cd $GOPATH && mkdir jemmyh && cd jemmyh && git clone https://github.com/JemmyH/terminal_note.git
 $ cd terminal_note && go build -o tnote && mv tnote $GOPATH/bin/
 ```
 
diff --git a/cmd/add.go b/cmd/add.go
index 805a62d..fcd2ec7 100644
--- a/cmd/add.go
+++ b/cmd/add.go
@@ -16,8 +16,8 @@ limitations under the License.
 package cmd
 
 import (
+	"github.com/jemmyh/terminal_note/note"
 	"github.com/spf13/cobra"
-	"hujm.net/terminal_note/note"
 )
 
 var content string
diff --git a/cmd/create.go b/cmd/create.go
index b8b3c51..06d0e43 100644
--- a/cmd/create.go
+++ b/cmd/create.go
@@ -18,8 +18,8 @@ package cmd
 import (
 	"fmt"
 
+	"github.com/jemmyh/terminal_note/note"
 	"github.com/spf13/cobra"
-	"hujm.net/terminal_note/note"
 )
 
 // createCmd represents the create command
@@ -39,14 +39,4 @@ var createCmd = &cobra.Command{
 
 func init() {
 	rootCmd.AddCommand(createCmd)
-
-	// Here you will define your flags and configuration settings.
-
-	// Cobra supports Persistent Flags which will work for this command
-	// and all subcommands, e.g.:
-	// createCmd.PersistentFlags().String("foo", "", "A help for foo")
-
-	// Cobra supports local flags which will only run when this command
-	// is called directly, e.g.:
-	// createCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
 }
diff --git a/cmd/delete.go b/cmd/delete.go
index df4fdbc..04eec0b 100644
--- a/cmd/delete.go
+++ b/cmd/delete.go
@@ -16,8 +16,8 @@ limitations under the License.
 package cmd
 
 import (
+	"github.com/jemmyh/terminal_note/note"
 	"github.com/spf13/cobra"
-	"hujm.net/terminal_note/note"
 )
 
 var (
diff --git a/cmd/print.go b/cmd/print.go
index a08f954..0f3ccde 100644
--- a/cmd/print.go
+++ b/cmd/print.go
@@ -20,8 +20,8 @@ import (
 	"fmt"
 
 	"github.com/boltdb/bolt"
+	"github.com/jemmyh/terminal_note/note"
 	"github.com/spf13/cobra"
-	"hujm.net/terminal_note/note"
 )
 
 var (
@@ -99,6 +99,7 @@ func (p *printStruct) checkBreak(id []byte) bool {
 func (p *printStruct) printNote(n *note.Note) {
 	if p.verbose {
 		fmt.Println(n.String())
+		// TODO: use arrow 
 		// if p.reverse && n.PrevID != nil {
 		// 	fmt.Println("⇧")
 		// 	fmt.Println("|")
@@ -115,11 +116,10 @@ func (p *printStruct) printNote(n *note.Note) {
 var printCmd = &cobra.Command{
 	Use:   "print",
 	Short: "Print notes in your notebook",
-	PreRun: func(cmd *cobra.Command, args []string) {
+	PreRun: func(_ *cobra.Command, _ []string) {
 		CheckNotebook(GetUserName())
 	},
-	Run: func(cmd *cobra.Command, args []string) {
-		fmt.Printf("user: %s, myP:%+v \n", GetUserName(), myP)
+	Run: func(_ *cobra.Command, _ []string) {
 		userName := GetUserName()
 		passwd := GetInputPassword()
 		switch myP.printType {
@@ -144,7 +144,7 @@ var printCmd = &cobra.Command{
 				}
 			}
 		case "range":
-
+			// TODO: range print
 		default:
 			fmt.Println("invalid type: " + myP.printType)
 			return
diff --git a/cmd/root.go b/cmd/root.go
index aa3c45c..f4ef7a3 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -6,14 +6,14 @@ import (
 	"os"
 	"os/user"
 
+	"github.com/jemmyh/terminal_note/note"
 	"github.com/spf13/cobra"
 	"gopkg.in/AlecAivazis/survey.v1"
-	"hujm.net/terminal_note/note"
 )
 
 /*
 * @CreateTime: 2021/1/12 20:59
-* @Author: hujiaming
+* @Author: JemmyHu <hujm20151021@gmail.com>
 * @Description:
  */
 
@@ -31,13 +31,14 @@ var rootCmd = &cobra.Command{
 	Long:  `Terminal Notebook is CLI App, which is implemented by Golang.`,
 }
 
+// Execute ...
 func Execute() {
 	if err := rootCmd.Execute(); err != nil {
 		os.Exit(0)
 	}
 }
 
-// GetUserName ...
+// GetUserName returns the current logined user, the same as `whoami`
 func GetUserName() string {
 	if userName == "" {
 		u, _ := user.Current()
@@ -46,6 +47,7 @@ func GetUserName() string {
 	return userName
 }
 
+// CheckNotebook make app exit if user's notebook does not exist.
 func CheckNotebook(userName string) {
 	if !note.CheckDbFileExist(userName) {
 		fmt.Printf("No existing notebook found for %s. Use `create` to create one.\n", userName)
@@ -53,6 +55,7 @@ func CheckNotebook(userName string) {
 	}
 }
 
+// GetInputPassword gets password from stdin.
 func GetInputPassword() string {
 	password := ""
 	prompt := &survey.Password{Message: "Please type your password:"}
diff --git a/cmd/version.go b/cmd/version.go
index 9c28c59..967dda9 100644
--- a/cmd/version.go
+++ b/cmd/version.go
@@ -18,8 +18,8 @@ package cmd
 import (
 	"fmt"
 
+	"github.com/jemmyh/terminal_note/note"
 	"github.com/spf13/cobra"
-	"hujm.net/terminal_note/note"
 )
 
 // versionCmd represents the version command
@@ -35,6 +35,7 @@ func init() {
 	rootCmd.AddCommand(versionCmd)
 }
 
+// GetVersionStr returns the formated version string.
 func GetVersionStr() string {
 	return fmt.Sprintf("%s @%s", note.GetVersion(), note.GetAppName())
 }
diff --git a/main.go b/main.go
index 55b90d2..d33d423 100644
--- a/main.go
+++ b/main.go
@@ -4,7 +4,7 @@ import "github.com/jemmyh/terminal_note/cmd"
 
 /*
 * @CreateTime: 2021/1/14 15:31
-* @Author: hujiaming
+* @Author: JemmyHu <hujm20151021@gmail.com>
 * @Description:
  */
 
diff --git a/note/note.go b/note/note.go
index 927919e..09c138a 100644
--- a/note/note.go
+++ b/note/note.go
@@ -15,7 +15,7 @@ import (
 /*
 * @CreateTime: 2021/1/12 18:28
 * @Author: Jemmy@hujm20150121@gmail.com
-* @Description:
+* @Description: note is a message in notebook
  */
 
 // Note means a diary note
diff --git a/note/note_book.go b/note/note_book.go
index b87c1a5..9a596f1 100644
--- a/note/note_book.go
+++ b/note/note_book.go
@@ -15,7 +15,7 @@ import (
 /*
 * @CreateTime: 2021/1/12 18:30
 * @Author: Jemmy@hujm20150121@gmail.com
-* @Description:
+* @Description: notebook
  */
 
 // NoteBook represents a diary book that contains many diary notes.
diff --git a/note/note_book_test.go b/note/note_book_test.go
index 38e4775..5d81180 100644
--- a/note/note_book_test.go
+++ b/note/note_book_test.go
@@ -8,7 +8,7 @@ import (
 
 /*
 * @CreateTime: 2021/1/13 11:41
-* @Author: hujiaming
+* @Author: JemmyHu <hujm20151021@gmail.com>
 * @Description:
  */
 
diff --git a/note/note_iter.go b/note/note_iter.go
index 32ca354..7f29892 100644
--- a/note/note_iter.go
+++ b/note/note_iter.go
@@ -8,7 +8,7 @@ import (
 
 /*
 * @CreateTime: 2021/1/12 20:49
-* @Author: hujiaming
+* @Author: JemmyHu <hujm20151021@gmail.com>
 * @Description: a iterator for note
  */
 
diff --git a/note/note_iter_test.go b/note/note_iter_test.go
index c31e297..554e0e3 100644
--- a/note/note_iter_test.go
+++ b/note/note_iter_test.go
@@ -4,7 +4,7 @@ import "testing"
 
 /*
 * @CreateTime: 2021/1/13 16:09
-* @Author: hujiaming
+* @Author: JemmyHu <hujm20151021@gmail.com>
 * @Description:
  */
 
diff --git a/note/note_test.go b/note/note_test.go
index 0f92dc7..6f9fb1d 100644
--- a/note/note_test.go
+++ b/note/note_test.go
@@ -3,13 +3,11 @@ package note
 import (
 	"testing"
 	"time"
-
-	"github.com/stretchr/testify/assert"
 )
 
 /*
 * @CreateTime: 2021/1/13 11:31
-* @Author: hujiaming
+* @Author: JemmyHu <hujm20151021@gmail.com>
 * @Description:
  */
 
@@ -23,17 +21,3 @@ func TestNewNote(t *testing.T) {
 	note = NewNote("test content")
 	t.Log(note.String())
 }
-
-func TestNote_Serialize(t *testing.T) {
-	data := note.Serialize()
-	t.Logf("data: %s", data)
-
-	newNote := DeserializeNote(data)
-	t.Log(newNote.String())
-	assert.Equal(t, note.String(), newNote.String())
-}
-
-func TestGetHeadNote(t *testing.T) {
-	head := GetHeadNote()
-	t.Log(head.String())
-}
diff --git a/note/rsa.go b/note/rsa.go
index 996eb7e..7ab9586 100644
--- a/note/rsa.go
+++ b/note/rsa.go
@@ -9,26 +9,26 @@ import (
 
 /*
 * @CreateTime: 2021/1/13 18:58
-* @Author: hujiaming
+* @Author: JemmyHu <hujm20151021@gmail.com>
 * @Description: rsa
-1. GenRsaKey 得到公私钥
-2. RsaEncrypt 传入要加密的数据 和 公钥，进行加密，得到加密后的数据
-3. RsaDecrypt 传入加密后的数据和私钥解密，得到解密后的数据
+1. GenRsaKey returns publicKey and privateKey
+2. RsaEncrypt input data needed to encrypt and publicKey, output data that has been encrypted
+3. RsaDecrypt input encrypted data and privateKey, output the decrypted data
 */
 
 // RSAGenKey generate rsa key pair.
 func RSAGenKey(bits int) (pubKey, prvKey []byte, err error) {
 	/*
-		生成私钥
+		generate privateKey
 	*/
-	// 1、使用RSA中的GenerateKey方法生成私钥
+	// 1、get a privateKey 
 	privateKey, err := rsa.GenerateKey(rand.Reader, bits)
 	if err != nil {
 		return nil, nil, err
 	}
-	// 2、通过X509标准将得到的RAS私钥序列化为：ASN.1 的DER编码字符串
+	// 2、Marshal the privateKey 
 	privateStream := x509.MarshalPKCS1PrivateKey(privateKey)
-	// 3、将私钥字符串设置到pem格式块中
+	// 3、put the marshaled privateKey into a Block
 	block1 := &pem.Block{
 		Type:  "private key",
 		Bytes: privateStream,
@@ -36,7 +36,7 @@ func RSAGenKey(bits int) (pubKey, prvKey []byte, err error) {
 	prvKey = pem.EncodeToMemory(block1)
 
 	/*
-		生成公钥
+		genarate publicKey from privateKey
 	*/
 	publicKey := privateKey.PublicKey
 	publicStream, err := x509.MarshalPKIXPublicKey(&publicKey)
@@ -52,24 +52,24 @@ func RSAGenKey(bits int) (pubKey, prvKey []byte, err error) {
 func RSAEncrypt(src []byte, pubKey []byte) (res []byte, err error) {
 	block, _ := pem.Decode(pubKey)
 
-	// 使用X509将解码之后的数据 解析出来
+	// unmarshal publicKey
 	keyInit, err := x509.ParsePKIXPublicKey(block.Bytes)
 	if err != nil {
 		return
 	}
 	publicKey := keyInit.(*rsa.PublicKey)
-	// 使用公钥加密数据
+	// encrypt data with publicKey
 	res, err = rsa.EncryptPKCS1v15(rand.Reader, publicKey, src)
 	return
 }
 
 // RSADecrypt decrypt encrypted data with private key.
 func RSADecrypt(encryptedSrc []byte, prvKey []byte) (res []byte, err error) {
-	// 解码
+	// decode the privateKey
 	block, _ := pem.Decode(prvKey)
 	blockBytes := block.Bytes
 	privateKey, err := x509.ParsePKCS1PrivateKey(blockBytes)
-	// 还原数据
+	// decrypt by privateKey
 	res, err = rsa.DecryptPKCS1v15(rand.Reader, privateKey, encryptedSrc)
 	return
 }
@@ -78,21 +78,18 @@ func RSADecrypt(encryptedSrc []byte, prvKey []byte) (res []byte, err error) {
 // RSAGenKeyWithPwd generate rsa pair key with specified password
 func RSAGenKeyWithPwd(bits int, pwd string) (pubKey, prvKey []byte, err error) {
 	/*
-		生成私钥
+		generate privateKey
 	*/
-	// 1、使用RSA中的GenerateKey方法生成私钥
 	privateKey, err := rsa.GenerateKey(rand.Reader, bits)
 	if err != nil {
 		return nil, nil, err
 	}
-	// 2、通过X509标准将得到的RAS私钥序列化为：ASN.1 的DER编码字符串
 	privateStream := x509.MarshalPKCS1PrivateKey(privateKey)
-	// 3、将私钥字符串设置到pem格式块中
 	block1 := &pem.Block{
 		Type:  "private key",
 		Bytes: privateStream,
 	}
-	// 通过自定义密码加密
+	// use optional password
 	if pwd != "" {
 		block1, err = x509.EncryptPEMBlock(rand.Reader, block1.Type, block1.Bytes, []byte(pwd), x509.PEMCipherAES256)
 		if err != nil {
@@ -102,7 +99,7 @@ func RSAGenKeyWithPwd(bits int, pwd string) (pubKey, prvKey []byte, err error) {
 	prvKey = pem.EncodeToMemory(block1)
 
 	/*
-		生成公钥
+		generate publuicKey from privateKey
 	*/
 	publicKey := privateKey.PublicKey
 	publicStream, err := x509.MarshalPKIXPublicKey(&publicKey)
@@ -116,7 +113,6 @@ func RSAGenKeyWithPwd(bits int, pwd string) (pubKey, prvKey []byte, err error) {
 
 // RSADecryptWithPwd decrypt src with private key and password
 func RSADecryptWithPwd(src []byte, prvKey []byte, pwd string) (res []byte, err error) {
-	// 解码
 	block, _ := pem.Decode(prvKey)
 	blockBytes := block.Bytes
 	if pwd != "" {
@@ -126,7 +122,6 @@ func RSADecryptWithPwd(src []byte, prvKey []byte, pwd string) (res []byte, err e
 		}
 	}
 	privateKey, err := x509.ParsePKCS1PrivateKey(blockBytes)
-	// 还原数据
 	res, err = rsa.DecryptPKCS1v15(rand.Reader, privateKey, src)
 	return
 }
diff --git a/note/rsa_test.go b/note/rsa_test.go
index 1266e43..2a71ce2 100644
--- a/note/rsa_test.go
+++ b/note/rsa_test.go
@@ -7,7 +7,7 @@ import (
 
 /*
 * @CreateTime: 2021/1/13 19:46
-* @Author: hujiaming
+* @Author: JemmyHu <hujm20151021@gmail.com>
 * @Description:
  */
 
diff --git a/note/varables.go b/note/varables.go
index 5ad1c05..597c78b 100644
--- a/note/varables.go
+++ b/note/varables.go
@@ -2,7 +2,7 @@ package note
 
 /*
 * @CreateTime: 2021/1/12 18:47
-* @Author: hujiaming
+* @Author: JemmyHu <hujm20151021@gmail.com>
 * @Description: define variables here
  */
 
@@ -74,10 +74,12 @@ func GetAppHome() string {
 	return appHome
 }
 
+// GetPubKeyName ...
 func GetPubKeyName() string {
 	return pubKeyTempName
 }
 
+// GetPrivateKeyName ...
 func GetPrivateKeyName() string {
 	return prvTempName
 }