diff --git a/build/templates/concrete.tpl.php b/build/templates/concrete.tpl.php
index 1049e97..7cb65d9 100644
--- a/build/templates/concrete.tpl.php
+++ b/build/templates/concrete.tpl.php
@@ -29,6 +29,8 @@
 
 /**
  * Concrete class for the Zabbix API.
+ *
+ * @final since confirm-it-solutions/php-zabbix-api 2.x
  */
 class <CLASSNAME_CONCRETE> extends <CLASSNAME_ABSTRACT>
 {