diff --git a/oauth2.conf b/oauth2.conf
index 5db3c5a..7b441f1 100644
--- a/oauth2.conf
+++ b/oauth2.conf
@@ -19,9 +19,10 @@
 # Note that this directive must be defined before any OAuth2TokenVerify directive that uses it. 
 #
 # type             shm|file|redis|memcache   cache backend type for access token validation results, default is shm
-# options          <options>                 cache backend specific options, see Cache Options
+# options          <options>                 cache backend specific options in query encoded format, see Cache Options
+#                                            e.g name=myname&password=mypassword&encrypt=false
 #
-#OAuth2Cache <type> [<options>]
+#OAuth2Cache <type> [<options-in-query-encoded-format>]
 #
 #
 # OAuth2Cache Options:
@@ -54,6 +55,7 @@
 #
 # host                     <string> (localhost)           Redis server hostname
 # port                     <number> (6379)                Redis servver port
+# username                 <string> (<no authentication>) username used to authenticate to the Redis server
 # password                 <string> (<no authentication>) password used to authenticate to the Redis server