diff --git a/mailer.rst b/mailer.rst
index 8dc952f2fb9..feced29523b 100644
--- a/mailer.rst
+++ b/mailer.rst
@@ -334,6 +334,17 @@ the application or when using a self-signed certificate::
$dsn = 'smtp://user:pass@smtp.example.com?verify_peer=0';
+TLS Peer Fingerprint Verification
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Additional fingerprint verification can be enforced with the ``peer_fingerprint``
+option. This is especially useful when a self-signed certificate is used and
+disabling ``verify_peer`` is needed, but security is still desired. Fingerprint
+may be specified in sha1 (40 characters) or md5 (32 characters)::
+
+ $dsn = 'smtp://user:pass@smtp.example.com?peer_fingerprint=6A1CF3B08D175A284C30BC10DE19162307C7286E';
+
+
Overriding default SMTP authenticators
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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