diff --git a/singleton/src/main/java/com/iluwatar/IvoryTower.java b/singleton/src/main/java/com/iluwatar/IvoryTower.java
index db842675f..8bf01849e 100644
--- a/singleton/src/main/java/com/iluwatar/IvoryTower.java
+++ b/singleton/src/main/java/com/iluwatar/IvoryTower.java
@@ -3,6 +3,8 @@ package com.iluwatar;
 /**
  * 
  * Singleton class.
+ * Eagerly initialized static instance guarantees thread
+ * safety.
  * 
  */
 public class IvoryTower {