diff --git a/README.md b/README.md
index 335cb554..4b0099ff 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,7 @@ To report bugs use [engelsystem/issues](https://github.com/engelsystem/engelsyst
 ### Requirements
  * PHP >= 7.1
    * Required modules:
+     * dom
      * gettext
      * json
      * mbstring