Upon creating an extension for Magento, quite often you face with a necessity to create a custom attribute for product, category, customer etc. Of course, you can add a description somewhere in the extension’s documentation how to do it and do not bother you head. However, all Magento versions allow you to create an attribute on the fly during an extension’s installation. There were many topics how to do that in Magento 1.x, and let’s check what is the difference in the next major version of Magento.