public void writeSubInterfacesInfo() {
        if (classDoc.isInterface()) {
            List subInterfaces = classtree.allSubs(classDoc, false);
            if (subInterfaces.size() > 0) {
                dl();
                dt();
                boldText("doclet.Subinterfaces");
                writeClassLinks(LinkInfoImpl.CONTEXT_SUBINTERFACES,
                    subInterfaces);
            }
        }
    }