diff --git a/README.md b/README.md
index 4b0099ff..63ecb8a9 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,7 @@ To report bugs use [engelsystem/issues](https://github.com/engelsystem/engelsyst
      * PDO
        * mysql
      * xml/libxml/SimpleXML
+     * xmlwriter
  * MySQL-Server >= 5.7.8 or MariaDB-Server >= 10.2.2
  * Webserver, i.e. lighttpd, nginx, or Apache