[wildfly-dev] Where to add module definition in wildfly/build

When I add a new module definition for a new sub-module into wildfly/build directory, what is the right place? wildfly/build/src/main/resources/modules/system/layers/base/org/wildfly/extension? I see various modules using 3 different places: wildfly/build/src/main/resources/modules/system/layers/base/org/wildfly/extension wildfly/build/src/main/resources/modules/system/layers/base/org/wildfly wildfly/build/src/main/resources/modules/system/layers/base/org/jboss/as The hacking page (https://community.jboss.org/wiki/HackingOnWildFly) says to use the jboss/as one, but I suspect it could be out of date. Thanks, Cheng