diff --git a/README.md b/README.md
index e0fa90a..d76231b 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,8 @@ For all the following, DO NOT run docker or make commande as root or with sudo,
 
 https://wiki.archlinux.org/index.php/Docker#Installation
 
+https://wiki.archlinux.org/title/Users_and_groups#Group_management
+
 ## Clone this repos
 
 this will clone this repos (main docker environement) and the popsu.arch.fr drupal 7 & 9 source code (without sites/default folder nor mysq ddbs)