@CommandDefinition(name = "get", description = "\n")
public class GetOntologyCommand extends AbstractOntologyCommand {

	...

	@Option(shortName = 'h', name = "help", hasValue = false, required = false, overrideRequired = true,
			description = "Display help")
	private boolean help;

    @GroupCommandDefinition(name = "ontology", description = "",
            groupCommands = {GetOntologyCommand.class, ...})
    public static class OntologyCommands implements Command {
        @Override
        public CommandResult execute(CommandInvocation commandInvocation) throws IOException, InterruptedException {
            return CommandResult.SUCCESS;
        }
    }

commandInvocation.getShell().out().println(commandInvocation.getHelpInfo("get"));