diff --git a/bookstore/src/main/java/com/fjordtek/bookstore/config/WebSecurityConfig.java b/bookstore/src/main/java/com/fjordtek/bookstore/config/WebSecurityConfig.java
index 0990611..fc51f01 100644
--- a/bookstore/src/main/java/com/fjordtek/bookstore/config/WebSecurityConfig.java
+++ b/bookstore/src/main/java/com/fjordtek/bookstore/config/WebSecurityConfig.java
@@ -16,11 +16,19 @@ import com.fjordtek.bookstore.service.session.BookStoreAccessDeniedHandler;
 import com.fjordtek.bookstore.service.session.UserDetailServiceImpl;
 
 /**
-*
-* @see https://docs.spring.io/spring-security/site/docs/current/reference/html5/#multiple-httpsecurity
-*
-* @author Pekka Helenius
-*/
+ *
+ * This class and its subclasses extend Spring Framework security
+ * WebSecurityConfigurerAdapter configuration for HTTP end points and sessions.
+ * <p>
+ * The class uses a custom UserDetailService interface class implementation
+ * to determine proper user authorities.
+ * <p>
+ * This class has multiple sub-configurations for different end points.
+ *
+ * @see https://docs.spring.io/spring-security/site/docs/current/reference/html5/#multiple-httpsecurity
+ *
+ * @author Pekka Helenius
+ */
 
 @Configuration
 @EnableWebSecurity
diff --git a/bookstore/src/main/java/com/fjordtek/bookstore/model/book/BookRepositoryCustom.java b/bookstore/src/main/java/com/fjordtek/bookstore/model/book/BookRepositoryCustom.java
index d88cae7..fa5f736 100644
--- a/bookstore/src/main/java/com/fjordtek/bookstore/model/book/BookRepositoryCustom.java
+++ b/bookstore/src/main/java/com/fjordtek/bookstore/model/book/BookRepositoryCustom.java
@@ -1,9 +1,13 @@
+//Pekka Helenius <fincer89@hotmail.com>, Fjordtek 2020
+
 package com.fjordtek.bookstore.model.book;
 
 import java.util.List;
 
 /**
 *
+* This interface defines additional methods for BookRepository.
+*
 * @author Pekka Helenius
 */
 
diff --git a/bookstore/src/main/java/com/fjordtek/bookstore/model/book/BookRepositoryImpl.java b/bookstore/src/main/java/com/fjordtek/bookstore/model/book/BookRepositoryImpl.java
index c45db30..a0139bc 100644
--- a/bookstore/src/main/java/com/fjordtek/bookstore/model/book/BookRepositoryImpl.java
+++ b/bookstore/src/main/java/com/fjordtek/bookstore/model/book/BookRepositoryImpl.java
@@ -1,3 +1,5 @@
+//Pekka Helenius <fincer89@hotmail.com>, Fjordtek 2020
+
 package com.fjordtek.bookstore.model.book;
 
 import java.util.List;
@@ -10,6 +12,8 @@ import javax.persistence.TypedQuery;
 import org.springframework.transaction.annotation.Transactional;
 
 /**
+ *
+ * This class implements methods defined in BookRepositoryCustom interface.
  *
  * @author Pekka Helenius
  */
diff --git a/bookstore/src/main/java/com/fjordtek/bookstore/service/session/BookStoreAccessDeniedHandler.java b/bookstore/src/main/java/com/fjordtek/bookstore/service/session/BookStoreAccessDeniedHandler.java
index c4d5e64..adf6c77 100644
--- a/bookstore/src/main/java/com/fjordtek/bookstore/service/session/BookStoreAccessDeniedHandler.java
+++ b/bookstore/src/main/java/com/fjordtek/bookstore/service/session/BookStoreAccessDeniedHandler.java
@@ -1,3 +1,5 @@
+//Pekka Helenius <fincer89@hotmail.com>, Fjordtek 2020
+
 package com.fjordtek.bookstore.service.session;
 
 import java.io.IOException;
@@ -14,6 +16,16 @@ import org.springframework.stereotype.Component;
 
 import com.fjordtek.bookstore.service.HttpServerLogger;
 
+/**
+ *
+ * This class implements Spring Framework security AccessDeniedHandler
+ * interface with specific method overrides.
+ * <p>
+ * Main purpose is to properly handle erroneous client requests.
+ *
+ * @author Pekka Helenius
+ */
+
 @Component
 public class BookStoreAccessDeniedHandler implements AccessDeniedHandler {
 
diff --git a/bookstore/src/main/java/com/fjordtek/bookstore/service/session/UserDetailServiceImpl.java b/bookstore/src/main/java/com/fjordtek/bookstore/service/session/UserDetailServiceImpl.java
index 8513c3b..7213455 100644
--- a/bookstore/src/main/java/com/fjordtek/bookstore/service/session/UserDetailServiceImpl.java
+++ b/bookstore/src/main/java/com/fjordtek/bookstore/service/session/UserDetailServiceImpl.java
@@ -19,10 +19,12 @@ import com.fjordtek.bookstore.model.auth.UserRole;
 import com.fjordtek.bookstore.model.auth.UserRoleRepository;
 
 /**
-*
-*
-* @author Pekka Helenius
-*/
+ *
+ * This class implements Spring Framework security UserDetailsService interface,
+ * adding custom methods to define proper user authorities.
+ *
+ * @author Pekka Helenius
+ */
 
 @Service
 public class UserDetailServiceImpl implements UserDetailsService {