Create javadoc with multiple src dirs

I have a Util package with source files in three seperate directories, defined like so: - src/com/domain/util - src/Standard/com/domain/util - src/Extended/com/domain/util The package is built with the first set of files and either one of the second or third set, to create a total of two different implementations of the same interface. Now, I want to generate javadoc based on those files. How can I specify that? What I really want to do is `javadoc com.domain.util -sourcepath ./src;./src/Standard` to build the javadoc for the standard util package, and `javadoc com.domain.util -sourcepath ./src;./src/Extended` to build the javadoc for the extended util package. This doesn't work. The only way I've found so far to actually make it work is to merge the directory structure of the common classes and the Standard classes into another location and run with that for the standard javadoc, then do the same for the Extended package. Is there another way?