BookStack/database/migrations/2016_07_07_181521_add_summary_to_page_revisions.php

<?php

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

class AddSummaryToPageRevisions extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::table('page_revisions', function ($table) {
            $table->string('summary')->nullable();
        });
    }

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