task.jvm(options -> options.setMaxHeapSize("3g"));
        });

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

            task.sources(patternSet -> {