diff --git a/Cluster.php b/Cluster.php
index 108fdd5..385d19b 100644
--- a/Cluster.php
+++ b/Cluster.php
@@ -15,6 +15,11 @@
  */
 class Credis_Cluster
 {
+    /**
+     * Number of replicas for each server in the cluster
+     * @var int
+     */
+    protected $replicas;
     /**
      * Collection of Credis_Client objects attached to Redis servers
      * @var Credis_Client[]