diff --git a/contrib/test-size/readme b/contrib/test-size/readme
index ade1c88c7..f904ac2a7 100644
--- a/contrib/test-size/readme
+++ b/contrib/test-size/readme
@@ -2,8 +2,9 @@ to use it
 ---------------
 a. in phpcompta create a new "dossier"
 b. in the "accueil page" you can see it id
-c. ./simul.py|psql database_name (the database name is the DOMAIN_dossierID, replace the uppercase
+c. ./simul.py (-l|-x|-s) |psql database_name (the database name is the DOMAIN_dossierID, replace the uppercase
 			by the good values)
+	you must use -l -x or -s (see -h for help)
 
 
 for reusing the same database