diff --git a/builder/pom.xml b/builder/pom.xml
index b65ab86..fa18654 100644
--- a/builder/pom.xml
+++ b/builder/pom.xml
@@ -25,7 +25,7 @@
         <checkstyle.version>7.3</checkstyle.version>
         <sevntu-checkstyle-maven-plugin.version>1.22.0</sevntu-checkstyle-maven-plugin.version>
         <kemitix-checkstyle-ruleset.version>2.0.0-SNAPSHOT</kemitix-checkstyle-ruleset.version>
-        <kemitix-checkstyle-ruleset.level>2-naming</kemitix-checkstyle-ruleset.level>
+        <kemitix-checkstyle-ruleset.level>3-javadoc</kemitix-checkstyle-ruleset.level>
     </properties>
 
     <dependencyManagement>
diff --git a/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/CheckstyleRulesetBuilderApplication.java b/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/CheckstyleRulesetBuilderApplication.java
index 6fd5658..4d04c83 100644
--- a/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/CheckstyleRulesetBuilderApplication.java
+++ b/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/CheckstyleRulesetBuilderApplication.java
@@ -40,6 +40,11 @@ import org.springframework.boot.context.properties.EnableConfigurationProperties
 @SpringBootApplication
 public class CheckstyleRulesetBuilderApplication {
 
+    /**
+     * Main methods.
+     *
+     * @param args Command line arguments.
+     */
     public static void main(final String[] args) {
         SpringApplication.run(CheckstyleRulesetBuilderApplication.class, args);
     }
diff --git a/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/RuleLevel.java b/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/RuleLevel.java
index b118770..b88e4a7 100644
--- a/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/RuleLevel.java
+++ b/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/RuleLevel.java
@@ -25,7 +25,7 @@ SOFTWARE.
 package net.kemitix.checkstyle.ruleset.builder;
 
 /**
- * .
+ * Ruleset levels.
  *
  * @author Paul Campbell (pcampbell@kemitix.net)
  */
diff --git a/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/RuleParent.java b/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/RuleParent.java
index 5817842..576023e 100644
--- a/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/RuleParent.java
+++ b/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/RuleParent.java
@@ -25,7 +25,7 @@ SOFTWARE.
 package net.kemitix.checkstyle.ruleset.builder;
 
 /**
- * .
+ * Module parent to contain a rule.
  *
  * @author Paul Campbell (pcampbell@kemitix.net)
  */
diff --git a/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/RuleSource.java b/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/RuleSource.java
index eaac328..0e7db03 100644
--- a/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/RuleSource.java
+++ b/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/RuleSource.java
@@ -25,7 +25,7 @@ SOFTWARE.
 package net.kemitix.checkstyle.ruleset.builder;
 
 /**
- * .
+ * The origin of the rule.
  *
  * @author Paul Campbell (pcampbell@kemitix.net)
  */
diff --git a/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/package-info.java b/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/package-info.java
new file mode 100644
index 0000000..3be5c06
--- /dev/null
+++ b/builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/package-info.java
@@ -0,0 +1,31 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2016 Paul Campbell
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+/**
+ * Ruleset Builder.
+ *
+ * @author Paul Campbell (pcampbell@kemitix.net)
+ */
+
+package net.kemitix.checkstyle.ruleset.builder;