Bisame/database/migrations/2016_04_06_181000_add_position_to_sentence.php

<?php

use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class AddPositionToSentence extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::table('sentences', function ($table) {
            $table->boolean('position');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::table('sentences', function ($table) {
            $table->dropColumn('position');
        }); 
    }
}