Since version 2.3 freeciv contains a modpack installer (freeciv-modpack) for downloading and installing custom content. Users only need to enter a modpack URL, and it will be automatically correctly installed. Users are not more forced to download and copy each file to the correct directory manually, where correct was something that nobody seemed to know what it is for some operating systems. This document describes how you as custom modpack author can make your content available for an installation with freeciv-modpack.