diff -r 21933063dd9f -r 0fa3a7c885bd util/sasl/digest-md5.lua
--- a/util/sasl/digest-md5.lua	Sun Feb 28 22:23:03 2010 +0100
+++ b/util/sasl/digest-md5.lua	Sun Feb 28 22:32:12 2010 +0100
@@ -29,6 +29,21 @@
 --=========================
 --SASL DIGEST-MD5 according to RFC 2831
 
+--[[
+Supported Authentication Backends
+
+digest-md5:
+	function(username, domain, realm, encoding) -- domain and realm are usually the same; for some broken
+												-- implementations it's not
+		return digesthash, state;
+	end
+
+digest-md5-test:
+	function(username, domain, realm, encoding, digesthash)
+		return true or false, state;
+	end
+]]
+
 local function digest(self, message)
 	--TODO complete support for authzid