I find this comment misleading on several levels:
* declared are these properties obviously here, they are  just "used" in the widlfly modules module
* and "modules" is also very ambiguous. maven module vs the modules module vs the actual module.xml files in the wildfly modules module. I think it is the last option in this case. (on this note, I would not mind renaming the "modules" directory to "wildfly-modules")