diff --git a/README.md b/README.md
index b545aa5..8ad139b 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,7 @@ On aime les briques
 To run postgresql server + adminer in dev environnement (assuming you're running the backend manually with node), run :
 
 ```
+cp back-end/.env.example back-end/.env
 docker compose -f docker-compose.dev.yml up
 ```