diff --git a/visitor/src/main/java/com/iluwatar/App.java b/visitor/src/main/java/com/iluwatar/App.java
index 1bf7cbf26..1de762fff 100644
--- a/visitor/src/main/java/com/iluwatar/App.java
+++ b/visitor/src/main/java/com/iluwatar/App.java
@@ -1,5 +1,12 @@
 package com.iluwatar;
 
+/**
+ * 
+ * Visitor pattern defines mechanism to apply operations
+ * (UnitVisitor) on nodes (Unit) in hierarchy. New operations 
+ * can be added without altering the node interface.
+ *
+ */
 public class App 
 {
     public static void main( String[] args )
diff --git a/visitor/src/main/java/com/iluwatar/Unit.java b/visitor/src/main/java/com/iluwatar/Unit.java
index df77a9776..32cc93ed3 100644
--- a/visitor/src/main/java/com/iluwatar/Unit.java
+++ b/visitor/src/main/java/com/iluwatar/Unit.java
@@ -1,5 +1,10 @@
 package com.iluwatar;
 
+/**
+ *
+ * Interface for the nodes in hierarchy.
+ * 
+ */
 public abstract class Unit {
 
 	private Unit[] children;
diff --git a/visitor/src/main/java/com/iluwatar/UnitVisitor.java b/visitor/src/main/java/com/iluwatar/UnitVisitor.java
index dd55508c1..298b9f8cb 100644
--- a/visitor/src/main/java/com/iluwatar/UnitVisitor.java
+++ b/visitor/src/main/java/com/iluwatar/UnitVisitor.java
@@ -1,5 +1,10 @@
 package com.iluwatar;
 
+/**
+ * 
+ * Visitor interface.
+ *
+ */
 public interface UnitVisitor {
 
 	void visitSoldier(Soldier soldier);