To set a grouping for different packages, use the <groups/> configuration in your pom:
<project> ... <reporting> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-javadoc-plugin</artifactId> <version>2.5</version> <configuration> ... <groups> <group> <title>Core Packages</title> <packages>org.apache.maven.plugin.javadoc.test1</packages> </group> <group> <title>Extension Packages</title> <packages>org.apache.maven.plugin.javadoc.test2</packages> </group> </groups> ... </configuration> </plugin> </plugins> ... </reporting> ... </project>