diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 1f2d1d0de..9c235880d 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -163,7 +163,8 @@ optional)
 ### Code Guidelines
 * Each mod must provide `mod.conf`.
 * Mod names are snake case, and newly added mods start with `mcl_`, e.g.
-`mcl_core`, `mcl_farming`, `mcl_monster_eggs`
+`mcl_core`, `mcl_farming`, `mcl_monster_eggs`. Keep in mind Minetest
+does not support capital letters in mod names.
 * To export functions, store them inside a global table named like the
 mod, e.g.