diff --git a/singleton/src/main/java/com/iluwatar/App.java b/singleton/src/main/java/com/iluwatar/App.java
index bcfc338b0..01e26c4af 100644
--- a/singleton/src/main/java/com/iluwatar/App.java
+++ b/singleton/src/main/java/com/iluwatar/App.java
@@ -1,5 +1,11 @@
 package com.iluwatar;
 
+/**
+ * 
+ * Singleton pattern ensures that the class (IvoryTower) can have only
+ * one existing instance and provides global access to that instance.
+ *
+ */
 public class App 
 {
     public static void main( String[] args )
diff --git a/singleton/src/main/java/com/iluwatar/IvoryTower.java b/singleton/src/main/java/com/iluwatar/IvoryTower.java
index b676e3f69..d4030cb2e 100644
--- a/singleton/src/main/java/com/iluwatar/IvoryTower.java
+++ b/singleton/src/main/java/com/iluwatar/IvoryTower.java
@@ -1,5 +1,10 @@
 package com.iluwatar;
 
+/**
+ * 
+ * Singleton class.
+ *
+ */
 public class IvoryTower {
 
 	private static IvoryTower instance = new IvoryTower();