Laravel migration 表迁移给表添加注释

用了很久的 Laravel，在制作迁移的时候，我一直以为给表添加注释是这样的

用 $this->comment 给表添加注释

<?php 

Schema::create('wallets', function (Blueprint $table) {
    $table->comment = '钱包';
    $table->increments('id');
    $table->unsignedInteger('user_id')->comment('所属用户');
    $table->string('coin', 16)->comment('币种');
    $table->decimal('balance_available', 20, 8)->default(0)->comment('可用余额');
    $table->decimal('balance_locked', 20, 8)->default(0)->comment('冻结资产');
    $table->timestamps();
    $table->unique([
        'user_id',
        'coin'
    ]);
});

然后发现这是错的，错的，根本不起作用，正确的用法是

\DB::statement("ALTER TABLE `wallets` comment '钱包'");

范例

public function up()
{
    Schema::create('wallets', function (Blueprint $table) {
        $table->increments('id');
        $table->unsignedInteger('user_id')->comment('所属用户');
        $table->string('coin', 16)->comment('币种');
        $table->decimal('balance_available', 20, 8)->default(0)->comment('可用余额');
        $table->decimal('balance_locked', 20, 8)->default(0)->comment('冻结资产');
        $table->timestamps();
        $table->unique([
            'user_id',
            'coin'
        ]);
    });

    \DB::statement("ALTER TABLE `wallets` comment '钱包'");
}