diff --git a/models/res_partner_contract_annex.py b/models/res_partner_contract_annex.py
index a751955..1095018 100644
--- a/models/res_partner_contract_annex.py
+++ b/models/res_partner_contract_annex.py
@@ -12,6 +12,7 @@ class ContractOrderAnnex(models.Model, IDocument, Extension):
 
     name = fields.Char(string="Name",)
     display_name = fields.Char(compute="_compute_display_name",)
+    specification_name = fields.Char(compute="_compute_specification_name",)
     order_id = fields.Many2one(
         "sale.order",
         string="Order",
@@ -57,6 +58,13 @@ class ContractOrderAnnex(models.Model, IDocument, Extension):
         for record in self:
             record.display_name = "№{} {}".format(record.number or record.contract_id.contract_annex_number, record.name)
 
+    @api.depends('specification_name', 'contract_id', 'order_id')
+    def _compute_specification_name(self):
+        self.specification_name = _("{name} from {date}").format(
+            name="{}-{}".format(self.contract_id.name, self.order_id.name),
+            date=self.contract_id.get_date().strftime("%d.%m.%Y"),
+        )
+
     @api.model
     def create(self, values):
         record = super().create(values)
diff --git a/wizard/res_partner_contract_wizard.py b/wizard/res_partner_contract_wizard.py
index 7c715ad..811f3cb 100644
--- a/wizard/res_partner_contract_wizard.py
+++ b/wizard/res_partner_contract_wizard.py
@@ -161,13 +161,9 @@ class ContractWizard(models.TransientModel):
             if transient_field.technical_name and transient_field.value
         }
         if self.target._name == "res.partner.contract.annex":
-            # TODO: bad
             fields.update({
                 "annex_name": self.document_name,
-                "specification_name": _("{name} from {date}").format(
-                    name="{}-{}".format(self.target.contract_id.name, self.target.order_id.name),
-                    date=self.target.contract_id.get_date().strftime("%d.%m.%Y"),
-                ),
+                "specification_name": self.target.specification_name,
             })
 
         binary_data = get_document_from_values_stream(path_to_template, fields).read()