diff --git a/readme.md b/readme.md
index 65eed319ce6f7dc8b0ac8b63cb1dd3675f2795d8..c5e5c70785b81f2efe96a7da5f43c86896158cbc 100644
--- a/readme.md
+++ b/readme.md
@@ -115,7 +115,10 @@ Here are the generated file types:
 
 The whole configuration of the generation is handled by [OpenAPI Generator maven plugin](https://github.com/OpenAPITools/openapi-generator/) and is located in the [pom.xml](./pom.xml) file.
 
-To run this plugin and by this way generate the classes, you have to run the following command:
+Besides of that, the mapping between the DTOs and entities are done using [MapStruct](https://mapstruct.org/). 
+The mapper generation is done automatically during the build time.
+
+To run both and by this way generate the classes, you have to run the following command:
 
 ```jshelllanguage
 mvn clean install