diff --git a/docs/topics/extensions.rst b/docs/topics/extensions.rst
index 3cabcefdd..08272a25d 100644
--- a/docs/topics/extensions.rst
+++ b/docs/topics/extensions.rst
@@ -328,7 +328,7 @@ Emails can be sent using the MailSender class
 .. module:: scrapy.mail
    :synopsis: MailSender class
 
-.. class:: MailSender(smtphost=None, mailfrom=None, smtpuser=None, smtppass=None, smtpport=None)
+.. class:: MailSender
 
 To see a full list of parameters, including examples on how to instantiate MailSender and using mail settings, see :ref:`topics-email`