diff --git a/odoo/fields.py b/odoo/fields.py
index 9a0f3330566..a20a566188c 100644
--- a/odoo/fields.py
+++ b/odoo/fields.py
@@ -2623,7 +2623,7 @@ class Reference(Selection):
     """ Pseudo-relational field (no FK in database).
 
     The field value is stored as a :class:`string <str>` following the pattern
-    ``"res_model.res_id"`` in database.
+    ``"res_model,res_id"`` in database.
     """
     type = 'reference'