diff --git a/telebot/async_telebot.py b/telebot/async_telebot.py
index bf85813..64807ad 100644
--- a/telebot/async_telebot.py
+++ b/telebot/async_telebot.py
@@ -3224,7 +3224,7 @@ class AsyncTeleBot:
         :type has_spoiler: :obj:`bool`
 
         :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`
         """