diff --git a/admin_manual/configuration_server/config_sample_php_parameters.rst b/admin_manual/configuration_server/config_sample_php_parameters.rst
index ee82679a1..1fcb9ee10 100644
--- a/admin_manual/configuration_server/config_sample_php_parameters.rst
+++ b/admin_manual/configuration_server/config_sample_php_parameters.rst
@@ -1230,7 +1230,8 @@ Connection details for a Redis Cluster
 Only for use with Redis Clustering, for Sentinel-based setups use the single
 server configuration above, and perform HA on the hostname.
 
-Redis Cluster support requires the php module phpredis in version 3.0.0 or higher.
+Redis Cluster support requires the php module phpredis in version 3.0.0 or
+higher for PHP 7+ or phpredis in version 2.2.8 for PHP 5.6.
 
 Available failover modes:
  - \\RedisCluster::FAILOVER_NONE - only send commands to master nodes (default)