diff --git a/README.md b/README.md
index 67aae61..1245147 100644
--- a/README.md
+++ b/README.md
@@ -15,5 +15,5 @@ A manager that handles everything needed to use mods for Gamecraft.
 * If the zip contains a folder named Plugins, the manager will unzip it to Gamecraft's directory instead of the Plugins directory.
 * The mod dll must use the same name as the repository, including casing. The manager will rename single dlls automatically but can't handle zipped mods with different names.
 * If you have any other files as part of the release, the mod one (that needs to be downloaded to the game) must have the same name as the repository.
-* The release tag must be the same as the assembly version of the mod with an optional `v` prefix.
+* The release tag must be the same as the assembly version of the mod with an optional `v` prefix. It can also have a `-preview` suffix if it **only** works with preview versions of the game
 * Add the mod to the list at https://git.exmods.org/ExMods/html-site/src/branch/master/site/mods/modlist.tsv