MySQL - insert comment to column

CREATE TABLE `users` (

    `id` BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,

    `age` BIGINT(20) NOT NULL COMMENT 'My comment here - this is age of the user',

    PRIMARY KEY (`id`) USING BTREE

)

COLLATE='utf8_general_ci'

ENGINE=InnoDB

;

ALTER TABLE `users`

    ADD COLUMN `name` VARCHAR(256) NULL DEFAULT NULL COMMENT 'This is my comment' AFTER `age`;

ALTER TABLE `users`

    CHANGE COLUMN `name` `name` VARCHAR(256) NULL DEFAULT NULL COMMENT 'This is my second comment' AFTER `age`;