diff --git a/cookbook/email/gmail.rst b/cookbook/email/gmail.rst
index 6a64a82e1ea..9f925cad224 100644
--- a/cookbook/email/gmail.rst
+++ b/cookbook/email/gmail.rst
@@ -75,3 +75,13 @@ You're done!
 
     The ``gmail`` transport is simply a shortcut that uses the ``smtp`` transport
     and sets ``encryption``, ``auth_mode`` and ``host`` to work with Gmail.
+
+.. note::
+
+    Depending on your Gmail account settings, you may get authentication errors
+    within your app. If your Gmail account uses 2-Step-Verification, you should
+    `generate an App password`_ to use for your ``mailer_password`` parameter.
+    You should also ensure that you `allow less secure apps to access your Gmail account`_.
+
+.. _`generate an App password`: https://support.google.com/accounts/answer/185833
+.. _`allow less secure apps to access your Gmail account`: https://support.google.com/accounts/answer/6010255