diff --git a/README.md b/README.md
index 6bbadc3..49c46bb 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ Add this library to classpath:
     <dependency>
       <groupId>cz.jiripinkas</groupId>
       <artifactId>jsitemapgenerator</artifactId>
-      <version>4.4</version>
+      <version>4.5</version>
     </dependency>
 
 If you want to use "ping google / bing" functionality, also add this library to classpath:
diff --git a/pom.xml b/pom.xml
index fe4359d..d378eb0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>cz.jiripinkas</groupId>
     <artifactId>jsitemapgenerator</artifactId>
-    <version>4.4</version>
+    <version>4.5</version>
     <packaging>jar</packaging>
     <name>Java sitemap generator</name>
     <description>This library generates a web sitemap and can ping Google that it has changed. This project has been
diff --git a/src/main/java/cz/jiripinkas/jsitemapgenerator/generator/RssGenerator.java b/src/main/java/cz/jiripinkas/jsitemapgenerator/generator/RssGenerator.java
index b19d86d..7d08f75 100644
--- a/src/main/java/cz/jiripinkas/jsitemapgenerator/generator/RssGenerator.java
+++ b/src/main/java/cz/jiripinkas/jsitemapgenerator/generator/RssGenerator.java
@@ -20,7 +20,10 @@ public class RssGenerator extends AbstractGenerator<RssGenerator> {
     private String defaultExtension;
 
     /**
-     * Create RssGenerator
+     * Creates RssGenerator.
+     * This constructor is public, because sometimes somebody wants RssGenerator to be
+     * a Spring bean and Spring wants to create a proxy which requires public constructor.
+     * But you shouldn't call this constructor on your own, use {@link RssGenerator#of(String, String, String)} instead.
      *
      * @param baseUrl        Base URL
      * @param root           If Base URL is root (for example http://www.javavids.com or if
@@ -28,14 +31,14 @@ public class RssGenerator extends AbstractGenerator<RssGenerator> {
      * @param webTitle       Web title
      * @param webDescription Web description
      */
-    private RssGenerator(String baseUrl, boolean root, String webTitle, String webDescription) {
+    public RssGenerator(String baseUrl, boolean root, String webTitle, String webDescription) {
         super(baseUrl, root);
         this.webTitle = webTitle;
         this.webDescription = webDescription;
     }
 
     /**
-     * Create RssGenerator. Root = true.
+     * Creates RssGenerator. Root = true.
      *
      * @param baseUrl        Base URL
      * @param webTitle       Web title
diff --git a/src/main/java/cz/jiripinkas/jsitemapgenerator/generator/SitemapGenerator.java b/src/main/java/cz/jiripinkas/jsitemapgenerator/generator/SitemapGenerator.java
index b06f67e..9b391bc 100644
--- a/src/main/java/cz/jiripinkas/jsitemapgenerator/generator/SitemapGenerator.java
+++ b/src/main/java/cz/jiripinkas/jsitemapgenerator/generator/SitemapGenerator.java
@@ -17,9 +17,12 @@ public enum AdditionalNamespace {
     }
 
     /**
+     * This constructor is public, because sometimes somebody wants SitemapGenerator to be
+     * a Spring bean and Spring wants to create a proxy which requires public constructor.
+     * But you shouldn't call this constructor on your own, use {@link SitemapGenerator#of(String)} instead.
      * @param baseUrl Base URL
      */
-    private SitemapGenerator(String baseUrl) {
+    public SitemapGenerator(String baseUrl) {
         super(baseUrl);
     }
 
diff --git a/src/main/java/cz/jiripinkas/jsitemapgenerator/generator/SitemapIndexGenerator.java b/src/main/java/cz/jiripinkas/jsitemapgenerator/generator/SitemapIndexGenerator.java
index 902e25b..4ccf3e6 100644
--- a/src/main/java/cz/jiripinkas/jsitemapgenerator/generator/SitemapIndexGenerator.java
+++ b/src/main/java/cz/jiripinkas/jsitemapgenerator/generator/SitemapIndexGenerator.java
@@ -14,9 +14,12 @@
 public class SitemapIndexGenerator extends AbstractSitemapGenerator<SitemapIndexGenerator> {
 
     /**
-     * @param baseUrl Base url
+     * This constructor is public, because sometimes somebody wants SitemapIndexGenerator to be
+     * a Spring bean and Spring wants to create a proxy which requires public constructor.
+     * But you shouldn't call this constructor on your own, use {@link SitemapIndexGenerator#of(String)} instead.
+     * @param baseUrl Base URL
      */
-    private SitemapIndexGenerator(String baseUrl) {
+    public SitemapIndexGenerator(String baseUrl) {
         super(baseUrl);
     }
 
diff --git a/src/main/java/cz/jiripinkas/jsitemapgenerator/robots/RobotsTxtGenerator.java b/src/main/java/cz/jiripinkas/jsitemapgenerator/robots/RobotsTxtGenerator.java
index 6f4579b..80bf093 100644
--- a/src/main/java/cz/jiripinkas/jsitemapgenerator/robots/RobotsTxtGenerator.java
+++ b/src/main/java/cz/jiripinkas/jsitemapgenerator/robots/RobotsTxtGenerator.java
@@ -1,6 +1,7 @@
 package cz.jiripinkas.jsitemapgenerator.robots;
 
 import cz.jiripinkas.jsitemapgenerator.UrlUtil;
+import cz.jiripinkas.jsitemapgenerator.generator.SitemapGenerator;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -13,6 +14,14 @@ public class RobotsTxtGenerator {
 
     private String baseUrl;
 
+    /**
+     * This constructor is public, because sometimes somebody wants RobotsTxtGenerator to be
+     * a Spring bean and Spring wants to create a proxy which requires public constructor.
+     * But you shouldn't call this constructor on your own, use {@link RobotsTxtGenerator#of(String)} instead.
+     */
+    public RobotsTxtGenerator() {
+    }
+
     public static RobotsTxtGenerator of(String baseUrl) {
         RobotsTxtGenerator robotsTxtGenerator = new RobotsTxtGenerator();
         if (!baseUrl.endsWith("/")) {