diff --git a/adapter/src/main/java/com/iluwatar/App.java b/adapter/src/main/java/com/iluwatar/App.java
index 478434a49ef33a620cd98bbba262b19bc1b9ff8e..03ee1be47afc98166901e944317e3769ce58dd0b 100644
--- a/adapter/src/main/java/com/iluwatar/App.java
+++ b/adapter/src/main/java/com/iluwatar/App.java
@@ -1,5 +1,11 @@
 package com.iluwatar;
 
+/**
+ * 
+ * Adapter (GnomeEngineerAdapter) converts the interface of the
+ * target class (GoblinGlider) into suitable one.
+ *
+ */
 public class App 
 {
     public static void main( String[] args )
diff --git a/adapter/src/main/java/com/iluwatar/GnomeEngineerAdapter.java b/adapter/src/main/java/com/iluwatar/GnomeEngineerAdapter.java
index 76da454189dd47546341b168a135162cc7f7bf64..a502a8fc5b0dd2c20f61da96577bb45ae74f9c16 100644
--- a/adapter/src/main/java/com/iluwatar/GnomeEngineerAdapter.java
+++ b/adapter/src/main/java/com/iluwatar/GnomeEngineerAdapter.java
@@ -1,5 +1,10 @@
 package com.iluwatar;
 
+/**
+ * 
+ * Adapter class.
+ *
+ */
 public class GnomeEngineerAdapter {
 
 	private GoblinGlider glider;
diff --git a/adapter/src/main/java/com/iluwatar/GoblinGlider.java b/adapter/src/main/java/com/iluwatar/GoblinGlider.java
index 9d971c5045fb8faf03c784762bad05b60731ad59..5a34dd70bff9bbf518ea2a4a034fd835294b8af8 100644
--- a/adapter/src/main/java/com/iluwatar/GoblinGlider.java
+++ b/adapter/src/main/java/com/iluwatar/GoblinGlider.java
@@ -1,5 +1,10 @@
 package com.iluwatar;
 
+/**
+ * 
+ * Adaptee class.
+ *
+ */
 public class GoblinGlider {
 
 	public void attachGlider() {