diff --git a/telebot/__init__.py b/telebot/__init__.py
index 75b410a..27f4ca6 100644
--- a/telebot/__init__.py
+++ b/telebot/__init__.py
@@ -2263,7 +2263,7 @@ class TeleBot:
         :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`
         """