queryInterface.addColumn with references not add reference in mysql

[ningshen]

queryInterface.addColumn with references not work in mysql

queryInterface.addColumn('Contents', 'ToolId',  {
    type: Sequelize.INTEGER, 
    references: {
        model: 'Tools', 
        key: 'id'
    }
})

will result sql

ALTER TABLE `Contents` ADD `ToolId` INTEGER REFERENCES `Tools` (`id`);

this sql statement is not work.
mysql alter column

add column sql with reference should be:

ALTER TABLE `Contents` ADD `ToolId` INTEGER, ADD FOREIGN KEY (`ToolId`) REFERENCES `Tools` (`id`);