processDefinition.getDescription() does not return the process definition description as defined in the process definition XML file

In my process defition file I have this

...
<process description="This is the description of processdefA" key="processdefA" name="processdefA" xmlns="http://jbpm.org/4.0/jpdl">
...

I can create a process instance from it and all that, but I can't get at the description with the API (I got a processDefinition instance from the RepositoryService as usual):

System.out.println("processDefinition.getDescription=" + processDefinition.getDescription()); // returns null while I have a description in my XML file