diff --git a/client.go b/client.go
index adc3357..08dfac1 100644
--- a/client.go
+++ b/client.go
@@ -350,6 +350,7 @@ func (c *Client) WebWxVerifyUser(storage WechatStorage, info RecommendInfo, veri
 	return c.Do(req)
 }
 
+// 获取图片消息的图片响应
 func (c *Client) WebWxGetMsgImg(msg *Message, info LoginInfo) (*http.Response, error) {
 	path, _ := url.Parse(webWxGetMsgImgUrl)
 	params := url.Values{}
@@ -360,6 +361,7 @@ func (c *Client) WebWxGetMsgImg(msg *Message, info LoginInfo) (*http.Response, e
 	return c.Get(path.String())
 }
 
+// 获取语音消息的语音响应
 func (c *Client) WebWxGetVoice(msg *Message, info LoginInfo) (*http.Response, error) {
 	path, _ := url.Parse(webWxGetVoiceUrl)
 	params := url.Values{}
@@ -369,6 +371,7 @@ func (c *Client) WebWxGetVoice(msg *Message, info LoginInfo) (*http.Response, er
 	return c.Get(path.String())
 }
 
+// 获取视频消息的视频响应
 func (c *Client) WebWxGetVideo(msg *Message, info LoginInfo) (*http.Response, error) {
 	path, _ := url.Parse(webWxGetVideoUrl)
 	params := url.Values{}
@@ -378,6 +381,7 @@ func (c *Client) WebWxGetVideo(msg *Message, info LoginInfo) (*http.Response, er
 	return c.Get(path.String())
 }
 
+// 获取文件消息的文件响应
 func (c *Client) WebWxGetMedia(msg *Message, info LoginInfo) (*http.Response, error) {
 	path, _ := url.Parse(webWxGetMediaUrl)
 	params := url.Values{}
@@ -391,6 +395,7 @@ func (c *Client) WebWxGetMedia(msg *Message, info LoginInfo) (*http.Response, er
 	return c.Get(path.String())
 }
 
+// 用户退出
 func (c *Client) Logout(info LoginInfo) (*http.Response, error) {
 	path, _ := url.Parse(webWxLogoutUrl)
 	params := url.Values{}
diff --git a/message.go b/message.go
index 6f66efb..f0accc1 100644
--- a/message.go
+++ b/message.go
@@ -88,6 +88,7 @@ func (m *Message) SenderInGroup() (*User, error) {
 	return users.First(), nil
 }
 
+// 获取消息的接收者
 func (m *Message) Receiver() (*User, error) {
 	if m.IsSendByGroup() {
 		if sender, err := m.Sender(); err != nil {
@@ -187,10 +188,12 @@ func (m *Message) IsNotify() bool {
 	return m.MsgType == 51 && m.StatusNotifyCode != 0
 }
 
+// 判断消息是否为文件类型的消息
 func (m *Message) HasFile() bool {
 	return m.IsPicture() || m.IsVoice() || m.IsVideo() || m.IsMedia()
 }
 
+// 获取文件消息的文件
 func (m *Message) GetFile() (*http.Response, error) {
 	if !m.HasFile() {
 		return nil, errors.New("invalid message type")
@@ -210,7 +213,8 @@ func (m *Message) GetFile() (*http.Response, error) {
 	return nil, errors.New("unsupported type")
 }
 
-// 用在多个messageHandler之间传递信息
+// 往消息上下文中设置值
+// goroutine safe
 func (m *Message) Set(key string, value interface{}) {
 	m.mu.Lock()
 	defer m.mu.Unlock()
@@ -220,6 +224,8 @@ func (m *Message) Set(key string, value interface{}) {
 	m.item[key] = value
 }
 
+// 从消息上下文中获取值
+// goroutine safe
 func (m *Message) Get(key string) (value interface{}, exist bool) {
 	m.mu.RLock()
 	defer m.mu.RUnlock()
@@ -227,6 +233,7 @@ func (m *Message) Get(key string) (value interface{}, exist bool) {
 	return
 }
 
+// 消息初始化,根据不同的消息作出不同的处理
 func (m *Message) init(bot *Bot) {
 	m.Bot = bot
 	if m.IsSendByGroup() {
diff --git a/relations.go b/relations.go
index ef13b1c..ec6e8f3 100644
--- a/relations.go
+++ b/relations.go
@@ -13,28 +13,34 @@ func (f Friend) String() string {
 	return fmt.Sprintf("<Friend:%s>", f.NickName)
 }
 
+// 重命名当前好友
 func (f *Friend) RemarkName(name string) error {
 	return f.remakeName(name)
 }
 
+// 发送自定义消息
 func (f *Friend) SendMsg(msg *SendMessage) error {
 	return f.sendMsg(msg)
 }
 
+// 发送文本消息
 func (f *Friend) SendText(content string) error {
 	return f.sendText(content)
 }
 
+// 发送图片消息
 func (f *Friend) SendImage(file *os.File) error {
 	return f.sendImage(file)
 }
 
 type Friends []*Friend
 
+// 获取好友的数量
 func (f Friends) Count() int {
 	return len(f)
 }
 
+// 获取第一个好友
 func (f Friends) First() *Friend {
 	if f.Count() > 0 {
 		return f[0]
@@ -42,6 +48,7 @@ func (f Friends) First() *Friend {
 	return nil
 }
 
+// 获取最后一个好友
 func (f Friends) Last() *Friend {
 	if f.Count() > 0 {
 		return f[f.Count()-1]
@@ -49,18 +56,22 @@ func (f Friends) Last() *Friend {
 	return nil
 }
 
+// 根据用户名查找好友
 func (f Friends) SearchByUserName(limit int, username string) (results Friends) {
 	return f.Search(limit, func(friend *Friend) bool { return friend.User.UserName == username })
 }
 
+// 根据昵称查找好友
 func (f Friends) SearchByNickName(limit int, nickName string) (results Friends) {
 	return f.Search(limit, func(friend *Friend) bool { return friend.User.NickName == nickName })
 }
 
+// 根据备注查找好友
 func (f Friends) SearchByRemarkName(limit int, remarkName string) (results Friends) {
 	return f.Search(limit, func(friend *Friend) bool { return friend.User.RemarkName == remarkName })
 }
 
+// 根据自定义条件查找好友
 func (f Friends) Search(limit int, condFuncList ...func(friend *Friend) bool) (results Friends) {
 	if condFuncList == nil {
 		return f
@@ -85,6 +96,7 @@ func (f Friends) Search(limit int, condFuncList ...func(friend *Friend) bool) (r
 	return
 }
 
+// 向slice的好友依次发送消息
 func (f Friends) SendMsg(msg *SendMessage) error {
 	for _, friend := range f {
 		if err := friend.SendMsg(msg); err != nil {
@@ -94,6 +106,7 @@ func (f Friends) SendMsg(msg *SendMessage) error {
 	return nil
 }
 
+// 向slice的好友依次发送文本消息
 func (f Friends) SendText(text string) error {
 	for _, friend := range f {
 		if err := friend.SendText(text); err != nil {