Adding column field, please help

[jokerfool]

This is my current database with MySQL, everything works really well and submitting data to it works really well.

CREATE DATABASE bril_mx;

use test;

CREATE TABLE users (
	id INT(11) UNSIGNED AUTO_INCREMENT PRIMARY KEY, 
	firstname VARCHAR(30) NOT NULL,
	email VARCHAR(50) NOT NULL,
	age INT(3),
	location VARCHAR(50),
	date TIMESTAMP
);

However, I would now like to add an additional column field called username.

Is this the correct procedure to add username?

ALTER TABLE test
ADD UserName varchar(255);

Thank you.