public function add_cap( $args, $assoc_args ) {
		$user = $this->fetcher->get_check( $args[0] );
		if ( $user ) {
			$cap = $args[1];
			$user->add_cap( $cap );

			WP_CLI::success( "Added '{$cap}' capability for {$user->user_login} ({$user->ID})." );
		}
	}