diff --git a/integrationtest/src/test/resources/lombokBuilderTest/src/main/java/org/mapstruct/itest/lombok/PersonMapper.java b/integrationtest/src/test/resources/lombokBuilderTest/src/test/java/org/mapstruct/itest/lombok/PersonMapper.java
similarity index 81%
rename from integrationtest/src/test/resources/lombokBuilderTest/src/main/java/org/mapstruct/itest/lombok/PersonMapper.java
rename to integrationtest/src/test/resources/lombokBuilderTest/src/test/java/org/mapstruct/itest/lombok/PersonMapper.java
index d2b766fb9..120396af0 100644
--- a/integrationtest/src/test/resources/lombokBuilderTest/src/main/java/org/mapstruct/itest/lombok/PersonMapper.java
+++ b/integrationtest/src/test/resources/lombokBuilderTest/src/test/java/org/mapstruct/itest/lombok/PersonMapper.java
@@ -22,6 +22,12 @@ import org.mapstruct.Mapper;
 import org.mapstruct.ReportingPolicy;
 import org.mapstruct.factory.Mappers;
 
+/**
+ * The Builder creation method is not present during the annotation processing of the mapper.
+ * Therefore we put the mapper into a separate class.
+ *
+ * @see <span>Lombok Issue <a href="https://github.com/rzwitserloot/lombok/issues/1538">#1538</a></span>
+ */
 @Mapper(unmappedTargetPolicy = ReportingPolicy.ERROR)
 public interface PersonMapper {