task.setOutputDir(extension.getUserManual().getStagingRoot().dir("render-single-html").get().getAsFile());
        });

        TaskProvider<AsciidoctorTask> userguideMultiPage = tasks.register("userguideMultiPage", AsciidoctorTask.class, task -> {
            task.setGroup("documentation");
            task.setDescription("Generates multi-page user manual.");