I guess you just need to include where to put the file, and how to activate it in the game.
If you are distributing the mod as a zipped pak file, it would need to be unzipped into the '..\Documents\Larian Studios\Divinity Original Sin\Mods' folder. If you zip the mod folder with the uncompressed files, it would go in the '..\Divinity - Original Sin\Data\Mods' install folder.