diff --git a/lib/imap.c b/lib/imap.c
index 075b3ad201..f1a94429c8 100644
--- a/lib/imap.c
+++ b/lib/imap.c
@@ -28,6 +28,7 @@
  * RFC4959 IMAP Extension for SASL Initial Client Response
  * RFC5092 IMAP URL Scheme
  * RFC6749 OAuth 2.0 Authorization Framework
+ * RFC8314 Use of TLS for Email Submission and Access
  * Draft   LOGIN SASL Mechanism <draft-murchison-sasl-login-00.txt>
  *
  ***************************************************************************/
diff --git a/lib/pop3.c b/lib/pop3.c
index 8dbd448b2c..c8f3965e49 100644
--- a/lib/pop3.c
+++ b/lib/pop3.c
@@ -30,6 +30,7 @@
  * RFC4752 The Kerberos V5 ("GSSAPI") SASL Mechanism
  * RFC5034 POP3 SASL Authentication Mechanism
  * RFC6749 OAuth 2.0 Authorization Framework
+ * RFC8314 Use of TLS for Email Submission and Access
  * Draft   LOGIN SASL Mechanism <draft-murchison-sasl-login-00.txt>
  *
  ***************************************************************************/
diff --git a/lib/smtp.c b/lib/smtp.c
index fec0026a24..f1fd9cc40b 100644
--- a/lib/smtp.c
+++ b/lib/smtp.c
@@ -28,6 +28,7 @@
  * RFC4954 SMTP Authentication
  * RFC5321 SMTP protocol
  * RFC6749 OAuth 2.0 Authorization Framework
+ * RFC8314 Use of TLS for Email Submission and Access
  * Draft   SMTP URL Interface   <draft-earhart-url-smtp-00.txt>
  * Draft   LOGIN SASL Mechanism <draft-murchison-sasl-login-00.txt>
  *