diff --git a/README.md b/README.md
index 44c2583..05d1025 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # PHP-FPM Zabbix Template with Auto Discovery and Multiple Pools
 
-![Zabbix versions](https://img.shields.io/badge/Zabbix_versions-4.4,_4.2,_4.0-green.svg?style=flat) ![PHP](https://img.shields.io/badge/PHP-5.6.x+-blue.svg?style=flat) ![PHP7](https://img.shields.io/badge/PHP7-supported-green.svg?style=flat) ![LLD](https://img.shields.io/badge/LLD-yes-green.svg?style=flat) ![ISPConfig](https://img.shields.io/badge/ISPConfig-supported-green.svg?style=flat)
+![Zabbix versions](https://img.shields.io/badge/Zabbix_versions-4.4,_4.2,_4.0-green.svg?style=flat) ![PHP](https://img.shields.io/badge/PHP-5.3.3+-blue.svg?style=flat) ![PHP7](https://img.shields.io/badge/PHP7-supported-green.svg?style=flat) ![LLD](https://img.shields.io/badge/LLD-yes-green.svg?style=flat) ![ISPConfig](https://img.shields.io/badge/ISPConfig-supported-green.svg?style=flat)
 
 ![Banner](https://github.com/rvalitov/zabbix-php-fpm/raw/master/media/repository-open-graph-template.png)
 
@@ -478,7 +478,8 @@ Most common problems of testing the `php-fpm.discover` key:
 - Error `ZBX_NOTSUPPORTED: Unsupported item key`. It means the `userparameter_php_fpm.conf` file is ignored by the Zabbix agent. Please, make sure that you copied this file to correct location and you have restarted the Zabbix agent.
 
 # Compatibility
-Should work with PHP 5.6.x and later, Zabbix 4.0.x and later. Can work with any version of ISPConfig as long as you have a valid PHP-FPM status page configuration there.
+Should work with any version of PHP-FPM (starting with PHP 5.3.3), Zabbix 4.0.x and later.
+Can work with any version of ISPConfig as long as you have a valid PHP-FPM status page configuration there.
 
 Tested with:
 - PHP 7.3