struggling with sequelize foreign key constraints

debug.js

var Sequelize = require('sequelize')
  , _         = require('lodash')
  , config    = require('./config/config.json')['development']
  , options
  , sequelize
  , Feed
  , Article
;

options = {
  define: {
    underscored: true
    , freezeTableName: true
  }
  , dialect: "sqlite"
  , storage: "rssmtp_dev.sqlite"
};

sequelize = new Sequelize('database', 'username', 'password', options);

Feed = sequelize.define('Feed', {
  url: Sequelize.STRING(2048)
}, {
  tableName: "feeds"
});

Article = sequelize.define('Article', {
  title: Sequelize.STRING(2048)
  , feed_id: {
    type: Sequelize.INTEGER
    , references: "feeds"
    , referencesKey: "id"
  }
}, {
  tableName: "articles"
});

Article.belongsTo(Feed);
Feed.hasMany(Article);


sequelize.sync({force: true}).done(function(err, models){
  Article.create({
    title: "Waffles"
  }).done(function(err, article){
    //
    // this should error out because a feed_id was not specified
    //
    console.log("ERR: ", err);
  });
});

/*

  sqlite3 dump:

PRAGMA foreign_keys=OFF;
BEGIN TRANSACTION;
CREATE TABLE `feeds` (`url` VARCHAR(2048), `id` INTEGER PRIMARY KEY AUTOINCREMENT, `created_at` DATETIME NOT NULL, `updated_at` DATETIME NOT NULL);
CREATE TABLE `articles` (`title` VARCHAR(2048), `feed_id` INTEGER REFERENCES `feeds` (`id`), `id` INTEGER PRIMARY KEY AUTOINCREMENT, `created_at` DATETIME NOT NULL, `updated_at` DATETIME NOT NULL);
INSERT INTO "articles" VALUES('Waffles',NULL,1,'2013-11-22 00:35:48','2013-11-22 00:35:48');
DELETE FROM sqlite_sequence;
INSERT INTO "sqlite_sequence" VALUES('articles',1);
COMMIT;

*/