cluster config file entries added to the example configuration file

redis.conf

@@ -319,6 +319,25 @@ auto-aof-rewrite-min-size 64mb
 # your server forever. Set it to 0 or a negative value for unlimited execution.
 lua-time-limit 60000
 
+################################ REDIS CLUSTER  ###############################
+#
+# Normal Redis instances can't be part of a Redis Cluster, only nodes that are
+# started as cluster nodes can. In order to start a Redis instance as a
+# cluster node enable the cluster support uncommenting the following:
+#
+# cluster-enabled yes
+
+# Every cluster node has a cluster configuration file. This file is not
+# intended to be edited by hand. It is created and updated by Redis nodes.
+# Every Redis Cluster node requires a different cluster configuration file.
+# Make sure that instances running in the same system does not have
+# overlapping cluster configuration file names.
+#
+# cluster-config-file nodes-6379.conf
+
+# In order to setup your cluster make sure to read the documentation
+# available at http://redis.io web site.
+
 ################################## SLOW LOG ###################################
 
 # The Redis Slow Log is a system to log queries that exceeded a specified