diff --git a/eopayment/paybox.py b/eopayment/paybox.py
index 161074b..fb8f066 100644
--- a/eopayment/paybox.py
+++ b/eopayment/paybox.py
@@ -230,7 +230,8 @@ class Payment(PaymentCommon):
             },
             {
                 'name': 'cle',
-                'caption': _('Site key'),
+                'caption': _('Clé'),
+                'help_text': _('Uniquement nécessaire pour l\'annulation / remboursement / encaissement (PayBox Direct)'),
                 'required': False,
                 'validation': lambda x: isinstance(x, six.string_types),
             },