[ISSUE-16300_maven] add comment

maven-modules/multimodulemavenproject/pom.xml

@@ -9,6 +9,13 @@
     <name>multimodulemavenproject</name>
     <packaging>pom</packaging>
 
+    <!--
+     No <parent> tag since we want the compiler plugin defined
+     in the <pluginManagement> to be used in submodules.
+     Detailed discussion:
+       https://jira.baeldung.com/browse/BAEL-7813
+    -->
+
     <modules>
         <module>maven-entitymodule</module>
         <module>maven-daomodule</module>
@@ -38,4 +45,4 @@
         <target.version>1.9</target.version>
     </properties>
 
-</project>
+</project>