# Defining Units¶

A tribe can have the following types of units: buildings (militarysites, partially_finished, productionsites, trainingsites and warehouses; headquarters are a special case of warehouse), immovables, workers, wares, and a ship.

The definitions for the tribes’ units are located in the subdirectories of data/tribes. Each unit needs to have an init.lua and a helptexts.lua file. The init.lua script will load the unit to be used in the game, and helptexts.lua will provide the information used by the in-game help (‘Tribal Encyclopedia’) and by our website’s online Encyclopedia.