# Extending

Essential Addons for YOOtheme Pro uses best practices when extending YOOtheme Pro, becoming in an essence a core feature. If you know how to extend YOOtheme Pro, you already know how to extend Essential Addons. However, we invite you to visit the YOOtheme Pro Developers Guide for reference and up to date best practices.

The Sources addon is encapsulated into a YOOtheme Pro Module named source located at plugins/system/yooessentials/modules in Joomla and wp-content/plugins/yooessentials/modules in WordPress.