diff --git a/README.md b/README.md
index 4bd006e..b8e2cdb 100644
--- a/README.md
+++ b/README.md
@@ -59,3 +59,12 @@ translations=PoolStringArray( "res://locale/fr.po", "res://locale/en.po", "res//
 
 To send your update, could you please create a branch and send us this branch?
 
+### Git sub modules
+
+This repository uses [submodule to git](https://git-scm.com/book/fr/v2/Utilitaires-Git-Sous-modules) :
+- when updating the repository for the first time after the adition of submodules, you will have to pass these commands to be sure you will get the submodules downloaded and updated. From your repository folder, pass :
+  - `git submodule init`
+  - `git submodule update`
+
+If you clone the repository for the first time, you can do everything in one command :
+- `git clone --recurse-submodules ssh://git@git.khaganat.net:3543/khaganat/mmorpg_khanat/khanat-client.git`