diff --git a/telebot/async_telebot.py b/telebot/async_telebot.py
index bc3f5d6..bf85813 100644
--- a/telebot/async_telebot.py
+++ b/telebot/async_telebot.py
@@ -3305,7 +3305,7 @@ class AsyncTeleBot:
         :type message_thread_id: :obj:`int`
 
         :param thumb: Deprecated. Use thumbnail instead
-
+:type thumbnail: :obj:`str` or :class:`telebot.types.InputFile`
         :return: On success, the sent Message is returned.
         :rtype: :class:`telebot.types.Message`
         """