diff --git a/memento/src/main/java/com/iluwatar/memento/App.java b/memento/src/main/java/com/iluwatar/memento/App.java
index 9411cb4fd..623ffb00e 100644
--- a/memento/src/main/java/com/iluwatar/memento/App.java
+++ b/memento/src/main/java/com/iluwatar/memento/App.java
@@ -1,36 +1,36 @@
-package com.iluwatar.memento;
-
-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) {
-		Stack<StarMemento> states = new Stack<>();
-
-		Star star = new Star(StarType.SUN, 10000000, 500000);
-		System.out.println(star);
-		states.add(star.getMemento());
-		star.timePasses();
-		System.out.println(star);
-		states.add(star.getMemento());
-		star.timePasses();
-		System.out.println(star);
-		states.add(star.getMemento());
-		star.timePasses();
-		System.out.println(star);
-		states.add(star.getMemento());
-		star.timePasses();
-		System.out.println(star);
-		while (states.size() > 0) {
-			star.setMemento(states.pop());
-			System.out.println(star);
-		}
-	}
-}
+package com.iluwatar.memento;
+
+import java.util.Stack;
+
+/**
+ * 
+ * Memento pattern is for storing and restoring object state. The object ({@link Star})
+ * gives out a "memento" ({@link 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) {
+		Stack<StarMemento> states = new Stack<>();
+
+		Star star = new Star(StarType.SUN, 10000000, 500000);
+		System.out.println(star);
+		states.add(star.getMemento());
+		star.timePasses();
+		System.out.println(star);
+		states.add(star.getMemento());
+		star.timePasses();
+		System.out.println(star);
+		states.add(star.getMemento());
+		star.timePasses();
+		System.out.println(star);
+		states.add(star.getMemento());
+		star.timePasses();
+		System.out.println(star);
+		while (states.size() > 0) {
+			star.setMemento(states.pop());
+			System.out.println(star);
+		}
+	}
+}
diff --git a/memento/src/main/java/com/iluwatar/memento/StarType.java b/memento/src/main/java/com/iluwatar/memento/StarType.java
index 442025525..bae853097 100644
--- a/memento/src/main/java/com/iluwatar/memento/StarType.java
+++ b/memento/src/main/java/com/iluwatar/memento/StarType.java
@@ -1,17 +1,22 @@
-package com.iluwatar.memento;
-
-public enum StarType {
-
-	SUN("sun"), RED_GIANT("red giant"), WHITE_DWARF("white dwarf"), SUPERNOVA("supernova"), DEAD("dead star"), UNDEFINED("");
-
-    private String title;
-
-    StarType(String title) {
-        this.title = title;
-    }
-
-    @Override
-	public String toString() {
-		return title;
-	}
-}
+package com.iluwatar.memento;
+
+/**
+ * 
+ * StarType enumeration
+ *
+ */
+public enum StarType {
+
+	SUN("sun"), RED_GIANT("red giant"), WHITE_DWARF("white dwarf"), SUPERNOVA("supernova"), DEAD("dead star"), UNDEFINED("");
+
+    private String title;
+
+    StarType(String title) {
+        this.title = title;
+    }
+
+    @Override
+	public String toString() {
+		return title;
+	}
+}
diff --git a/memento/src/test/java/com/iluwatar/memento/AppTest.java b/memento/src/test/java/com/iluwatar/memento/AppTest.java
index 72bd5946d..84afd5945 100644
--- a/memento/src/test/java/com/iluwatar/memento/AppTest.java
+++ b/memento/src/test/java/com/iluwatar/memento/AppTest.java
@@ -1,14 +1,19 @@
-package com.iluwatar.memento;
-
-import org.junit.Test;
-
-import com.iluwatar.memento.App;
-
-public class AppTest {
-
-	@Test
-	public void test() {
-		String[] args = {};
-		App.main(args);
-	}
-}
+package com.iluwatar.memento;
+
+import org.junit.Test;
+
+import com.iluwatar.memento.App;
+
+/**
+ * 
+ * Application test
+ *
+ */
+public class AppTest {
+
+	@Test
+	public void test() {
+		String[] args = {};
+		App.main(args);
+	}
+}