diff --git a/src/main/java/org/apache/maven/shared/dependency/tree/DependencyTreeResolutionListener.java b/src/main/java/org/apache/maven/shared/dependency/tree/DependencyTreeResolutionListener.java
index 3da8e1f..642378c 100644
--- a/src/main/java/org/apache/maven/shared/dependency/tree/DependencyTreeResolutionListener.java
+++ b/src/main/java/org/apache/maven/shared/dependency/tree/DependencyTreeResolutionListener.java
@@ -435,6 +435,7 @@
      *            the attached artifact for the new dependency node
      * @return the new dependency node
      */
+    // package protected for unit test
     DependencyNode addNode( Artifact artifact )
     {
         DependencyNode node = createNode( artifact );