Why Sequelize issues "SHOW INDEX FROM `table`"?

If you would enable Sequelize logging, you would see that during the "sync" phase and right after creating a table, Sequelize executes SHOW INDEX FROM table query. The question is - why? To be more specific, here is the code I'm executing: var Sequelize = require('sequelize'); var connection = new Sequelize('demo_schema', 'root', 'password'); var Article = connection.define('article', { slug: { type: Sequelize.STRING, primaryKey: true }, title: { type: Sequelize.STRING, unique: true, allowNull: false }, body: { type: Sequelize.TEXT } }, { timestamps: false }); connection.sync({ force: true, logging: console.log }).then(function () { // TODO }); Here is the output on the console: Executing (default): DROP TABLE IF EXISTS `articles`; Executing (default): DROP TABLE IF EXISTS `articles`; Executing (default): CREATE TABLE IF NOT EXISTS `articles` (`slug` VARCHAR(255) , `title` VARCHAR(255) NOT NULL UNIQUE, `body` TEXT, UNIQUE `articles_title_unique` (`title`), PRIMARY KEY (`slug`)) ENGINE=InnoDB; Executing (default): SHOW INDEX FROM `articles`