diff --git a/telebot/__init__.py b/telebot/__init__.py
index ffde7e3..c182463 100644
--- a/telebot/__init__.py
+++ b/telebot/__init__.py
@@ -695,7 +695,7 @@ class TeleBot:
 
     def send_audio(self, chat_id, audio, caption=None, duration=None, performer=None, title=None,
                    reply_to_message_id=None, reply_markup=None, parse_mode=None, disable_notification=None,
-                   timeout=None):
+                   timeout=None, thumb=None):
         """
         Use this method to send audio files, if you want Telegram clients to display them in the music player. Your audio must be in the .mp3 format.
         :param chat_id:Unique identifier for the message recipient
@@ -709,11 +709,12 @@ class TeleBot:
         :param parse_mode
         :param disable_notification:
         :param timeout:
+	:param thumb:
         :return: Message
         """
         return types.Message.de_json(
             apihelper.send_audio(self.token, chat_id, audio, caption, duration, performer, title, reply_to_message_id,
-                                 reply_markup, parse_mode, disable_notification, timeout))
+                                 reply_markup, parse_mode, disable_notification, timeout, thumb))
 
     def send_voice(self, chat_id, voice, caption=None, duration=None, reply_to_message_id=None, reply_markup=None,
                    parse_mode=None, disable_notification=None, timeout=None):
@@ -771,7 +772,7 @@ class TeleBot:
                 disable_notification, timeout))
 
     def send_video(self, chat_id, data, duration=None, caption=None, reply_to_message_id=None, reply_markup=None,
-                   parse_mode=None, supports_streaming=None, disable_notification=None, timeout=None):
+                   parse_mode=None, supports_streaming=None, disable_notification=None, timeout=None, thumb=None):
         """
         Use this method to send video files, Telegram clients support mp4 videos.
         :param chat_id: Integer : Unique identifier for the message recipient — User or GroupChat id
@@ -784,11 +785,12 @@ class TeleBot:
         :param reply_markup:
         :param disable_notification:
         :param timeout:
+	:param thumb:
         :return:
         """
         return types.Message.de_json(
             apihelper.send_video(self.token, chat_id, data, duration, caption, reply_to_message_id, reply_markup,
-                                 parse_mode, supports_streaming, disable_notification, timeout))
+                                 parse_mode, supports_streaming, disable_notification, timeout, thumb))
 
     def send_animation(self, chat_id, animation, duration=None, caption=None, reply_to_message_id=None, reply_markup=None,
                    parse_mode=None, disable_notification=None, timeout=None):
diff --git a/telebot/apihelper.py b/telebot/apihelper.py
index 8a6ae75..c4ab906 100644
--- a/telebot/apihelper.py
+++ b/telebot/apihelper.py
@@ -435,7 +435,7 @@ def send_chat_action(token, chat_id, action, timeout=None):
 
 
 def send_video(token, chat_id, data, duration=None, caption=None, reply_to_message_id=None, reply_markup=None,
-               parse_mode=None, supports_streaming=None, disable_notification=None, timeout=None):
+               parse_mode=None, supports_streaming=None, disable_notification=None, timeout=None, thumb=None):
     method_url = r'sendVideo'
     payload = {'chat_id': chat_id}
     files = None
@@ -459,6 +459,11 @@ def send_video(token, chat_id, data, duration=None, caption=None, reply_to_messa
         payload['disable_notification'] = disable_notification
     if timeout:
         payload['connect-timeout'] = timeout
+    if thumb:
+        if not util.is_string(thumb):
+            files['thumb'] = thumb
+        else:
+            payload['thumb'] = thumb
     return _make_request(token, method_url, params=payload, files=files, method='post')
 
 
@@ -541,7 +546,7 @@ def send_video_note(token, chat_id, data, duration=None, length=None, reply_to_m
 
 
 def send_audio(token, chat_id, audio, caption=None, duration=None, performer=None, title=None, reply_to_message_id=None,
-               reply_markup=None, parse_mode=None, disable_notification=None, timeout=None):
+               reply_markup=None, parse_mode=None, disable_notification=None, timeout=None, thumb=None):
     method_url = r'sendAudio'
     payload = {'chat_id': chat_id}
     files = None
@@ -567,6 +572,11 @@ def send_audio(token, chat_id, audio, caption=None, duration=None, performer=Non
         payload['disable_notification'] = disable_notification
     if timeout:
         payload['connect-timeout'] = timeout
+    if thumb:
+        if not util.is_string(thumb):
+            files['thumb'] = thumb
+        else:
+            payload['thumb'] = thumb
     return _make_request(token, method_url, params=payload, files=files, method='post')