diff --git a/memcached-api.php b/memcached-api.php
index 11ddb29..48fe948 100644
--- a/memcached-api.php
+++ b/memcached-api.php
@@ -70,6 +70,8 @@ class Memcached {
 	const OPT_NOREPLY;
 
 	const OPT_VERIFY_KEY;
+	
+	const OPT_RANDOMIZE_REPLICA_READS;
 
 
 	/**