README.m4: Add a link to the GSSAPI-in-SASL spec.

diff --git a/README.md b/README.md
index 842f723475fa8d59538f4f444a927a4d6fc0a7f6..5a6e6c8bcc5af949310a1976376b3ccb84aa1e5c 100644 (file)
--- a/README.md
+++ b/README.md
@@ -32,7 +32,7 @@ Auth
 - [RFC2595 - Using TLS with IMAP, POP3 and ACAP](https://tools.ietf.org/html/rfc2595)
 - [RFC2831 - Using Digest Authentication as a SASL Mechanism (DIGEST-MD5)](https://tools.ietf.org/html/rfc2831)
 - [RFC5802 - Salted Challenge Response Authentication Mechanism (SCRAM)](https://tools.ietf.org/html/rfc5802)
-- SASL and GSS-API Mechanisms 
+- [RFC4752 - GSS-API (Kerberos V5) SASL Mechanism](https://tools.ietf.org/doc/html/rfc4752)
 - [RFC7628 - A Set of Simple Authentication and Security Layer (SASL) Mechanisms for OAuth](https://tools.ietf.org/html/rfc7628)
 - [Google XOAUTH2 protocol](https://developers.google.com/gmail/xoauth2_protocol)