Laravel 数据库迁移文件内如何对字段和表写注释？

public function up()
{
    Schema::create('users', function (Blueprint $table) {
        $table->increments('id')->comment('用户id');
        $table->string('name')->comment('用户名');
        $table->string('email')->unique()->comment('邮箱');
        $table->timestamp('email_verified_at')->nullable()->comment('Email验证时间');
        $table->string('password')->comment('密码');
        $table->rememberToken()->comment('记住我');
        $table->timestamps();
    });
    DB::statement("ALTER TABLE 'users' comment'用户表'");//表注释
}

这样写会提示语法冲突