diff --git a/HowtoMySQL.md b/HowtoMySQL.md
index 83f09034..a0acac70 100644
--- a/HowtoMySQL.md
+++ b/HowtoMySQL.md
@@ -1207,6 +1207,7 @@ Créer le dossier qui va accueillir le *datadir* et donner les bons droits :
 
 ~~~
 # mkdir -p /srv/mysql-instances/foo
+# chmod 755 /srv /srv/mysql-instances
 # chown -R mysql-foo:mysql-foo /srv/mysql-instances
 ~~~