Of course, sometimes usage information doesn't provide enough detail. How about some actual program help?

    public static void main(String[] args) throws Exception {
        JSAP jsap = new JSAP();
        
        FlaggedOption opt1 = new FlaggedOption("count")
                                .setStringParser(new IntegerStringParser())
                                .setDefault("1") 
                                .setRequired(true) 
                                .setShortFlag('n') 
                                .setLongFlag(JSAP.NO_LONGFLAG);
                                
        opt1.setHelp("The number of times to say hello (default=1).");
        jsap.registerParameter(opt1);
        
        Switch sw1 = new Switch("verbose")
                        .setShortFlag('v')
                        .setLongFlag("verbose");
        sw1.setHelp("Requests verbose output.");
        jsap.registerParameter(sw1);
        
        UnflaggedOption opt2 = new UnflaggedOption("name")
                                .setStringParser(new StringStringParser())
                                .setDefault("World")
                                .setRequired(true)
                                .setGreedy(true);
        
        opt2.setHelp("One or more names of people you would like to greet.");
        jsap.registerParameter(opt2);
        
        JSAPResult config = jsap.parse(args);    

        if (!config.success()) {
            System.err.println();
            System.err.println("Usage: java "
                                + Manual_HelloWorld_6.class.getName());
            System.err.println("                "
                                + jsap.getUsage());
            System.err.println();
            // show full help as well
            System.err.println(jsap.getHelp());
            System.exit(1);
        }
        
        String[] names = config.getStringArray("name");
        for (int i = 0; i < config.getInt("count"); ++i) {
            for (int j = 0; j < names.length; ++j) {
                System.out.println((config.getBoolean("verbose") ? "Hello" : "Hi")
                                + ", "
                                + names[j]
                                + "!");
            }
        }
    }

[mlamb@morbo]$ java com.martiansoftware.jsap.examples.Manual_HelloWorld_6 -n 2 -n 4

Usage: java com.martiansoftware.jsap.examples.Manual_HelloWorld_6
                -n <count> [-v|--verbose] name1 name2 ... nameN

  -n <count>               The number of times to say hello (default=1).      
  [-v|--verbose]           Requests verbose output.                           
  name1 name2 ... nameN    One or more names of people you would like to      
                           greet.                                             


[mlamb@morbo]$ java com.martiansoftware.jsap.examples.Manual_HelloWorld_6 --nosuchflag

Usage: java com.martiansoftware.jsap.examples.Manual_HelloWorld_6
                -n <count> [-v|--verbose] name1 name2 ... nameN

  -n <count>               The number of times to say hello (default=1).      
  [-v|--verbose]           Requests verbose output.                           
  name1 name2 ... nameN    One or more names of people you would like to      
                           greet.                                             

In HelloWorld_3 you learned how to add a Switch (verbose). Combine a -h / --help switch with the getHelp() method as used here, and you've made your program much friendlier.