diff --git a/plugins/percona/percona_ b/plugins/percona/percona_
index 74d64c9d..f06f6e5a 100644
--- a/plugins/percona/percona_
+++ b/plugins/percona/percona_
@@ -2,7 +2,12 @@
 # -*- coding: utf-8 -*-
 # vim: set fileencoding=utf-8
 #
-# Munin plugin for percona
+# Munin plugin for Percona XtraDB Cluster. Monitors values of these cluster replication variables:
+# percona_queues: wsrep_local_recv_queue, wsrep_local_send_queue
+# percona_flow: wsrep_flow_control_sent, wsrep_flow_control_recv
+# percona_transactions: wsrep_replicated, wsrep_received
+# percona_transactions_bytes: wsrep_replicated_bytes, wsrep_received_bytes
+# percona_replication: wsrep_local_cert_failures, wsrep_local_bf_aborts
 #
 # created by Sven Schliesing
 # borrowed code from mysql_aggregate_ by Igor Borodikhin
@@ -26,7 +31,7 @@
 # 	percona_transactions
 # 	percona_transactions_bytes
 #
-# Minimal config for monitoring local Percona-Server:
+# Minimal config for monitoring local Percona XtraDB Cluster-Server:
 #
 #     [percona]
 #     env.user root