diff --git a/sdm/src/java/iterator/ITicketIterator.java b/sdm/src/java/iterator/ITicketIterator.java
index af2fafa..3a88f62 100644
--- a/sdm/src/java/iterator/ITicketIterator.java
+++ b/sdm/src/java/iterator/ITicketIterator.java
@@ -2,7 +2,7 @@
 
 import java.util.Iterator;
 
-public interface ITicketIterator extends Iterator<Integer>
+public interface ITicketIterator extends Iterator<Integer> // Is this interface really necessary? In any case you could keep it though!
 {
     boolean hasNext();
 
diff --git a/sdm/src/java/singleton/Singleton.java b/sdm/src/java/singleton/Singleton.java
index d3f868f..b8ecd91 100644
--- a/sdm/src/java/singleton/Singleton.java
+++ b/sdm/src/java/singleton/Singleton.java
@@ -2,13 +2,13 @@
 import java.util.Random;
 
 public class Singleton {
-    int behaviour;
-    private static final Singleton new_singleton = new Singleton();
+    int behaviour; // Visibility
+    private static final Singleton new_singleton = new Singleton(); // NewSingleton or UniqueInstance
     private Singleton()
     {
-            Random rand = new Random();
-            behaviour = rand.nextInt(50);
-    }
+            Random rand = new Random(); // Remove
+            behaviour = rand.nextInt(50); // this.behaviour
+    } 
     public static Singleton getInstance()
     {
         return new_singleton;