diff --git a/memento/src/main/java/com/iluwatar/App.java b/memento/src/main/java/com/iluwatar/App.java
index 7ee027c2d..c98bc320d 100644
--- a/memento/src/main/java/com/iluwatar/App.java
+++ b/memento/src/main/java/com/iluwatar/App.java
@@ -2,6 +2,15 @@ package com.iluwatar;
 
 import java.util.Stack;
 
+/**
+ * 
+ * Memento pattern is for storing and restoring object
+ * state. The object (Star) gives out a "memento" 
+ * (StarMemento) that contains the state of the object. 
+ * Later on the memento can be set back to the object 
+ * restoring the state.
+ *
+ */
 public class App 
 {
     public static void main( String[] args )
diff --git a/memento/src/main/java/com/iluwatar/Star.java b/memento/src/main/java/com/iluwatar/Star.java
index 90c1028fd..03a5ad305 100644
--- a/memento/src/main/java/com/iluwatar/Star.java
+++ b/memento/src/main/java/com/iluwatar/Star.java
@@ -1,5 +1,10 @@
 package com.iluwatar;
 
+/**
+ * 
+ * Star uses "mementos" to store and restore state.
+ *
+ */
 public class Star {
 	
 	private StarType type;
diff --git a/memento/src/main/java/com/iluwatar/StarMemento.java b/memento/src/main/java/com/iluwatar/StarMemento.java
index cc7238d12..9d2806ac2 100644
--- a/memento/src/main/java/com/iluwatar/StarMemento.java
+++ b/memento/src/main/java/com/iluwatar/StarMemento.java
@@ -1,5 +1,10 @@
 package com.iluwatar;
 
+/**
+ * 
+ * External interface to memento.
+ *
+ */
 public interface StarMemento {
 
 }
diff --git a/memento/src/main/java/com/iluwatar/StarMementoInternal.java b/memento/src/main/java/com/iluwatar/StarMementoInternal.java
index dd0e2c343..45c8f7c11 100644
--- a/memento/src/main/java/com/iluwatar/StarMementoInternal.java
+++ b/memento/src/main/java/com/iluwatar/StarMementoInternal.java
@@ -1,5 +1,10 @@
 package com.iluwatar;
 
+/**
+ * 
+ * Internal interface to memento.
+ *
+ */
 public class StarMementoInternal implements StarMemento {
 
 	private StarType type;