diff --git a/README.md b/README.md
index 1e39fc0265..912d1f2e7e 100644
--- a/README.md
+++ b/README.md
@@ -92,7 +92,7 @@ via `sqlalchemy`.
 
 Lancer le script:
 
-    su postgres 
+    sudo su
     cd /opt/scodoc/tools
     ./create_users_database.sh