Added comment about the usage of the test-jar.

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1733877 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 62d4f9e..e1776b4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -186,7 +186,7 @@
         </pluginManagement>
         <plugins>
           <!--
-           ! Why is the following needed?
+           ! The following is used within the src/it/user-filters test.
           -->
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>