diff --git a/beesdoo_shift/wizard/validate_attendance_sheet.py b/beesdoo_shift/wizard/validate_attendance_sheet.py
index 5ab4c3d..ca957cf 100644
--- a/beesdoo_shift/wizard/validate_attendance_sheet.py
+++ b/beesdoo_shift/wizard/validate_attendance_sheet.py
@@ -69,7 +69,7 @@ class ValidateAttendanceSheet(models.TransientModel):
     notes = fields.Text(related="active_sheet.notes", default="")
     feedback = fields.Text(related="active_sheet.feedback", default="")
     worker_nb_feedback = fields.Selection(
-        related="active_sheet.worker_nb_feedback", required=True
+        related="active_sheet.worker_nb_feedback"
     )
 
     def on_barcode_scanned(self, barcode):
@@ -85,6 +85,10 @@ class ValidateAttendanceSheet(models.TransientModel):
     @api.multi
     def validate_sheet(self):
         sheet = self.active_sheet
+
+        if not self.worker_nb_feedback:
+            raise UserError(_("Please give your feedback on the number of workers."))
+
         if self.card_support:
             # Login with barcode
             card = self.env["member.card"].search(
diff --git a/beesdoo_shift/wizard/validate_attendance_sheet.xml b/beesdoo_shift/wizard/validate_attendance_sheet.xml
index 0d475a3..05de63b 100644
--- a/beesdoo_shift/wizard/validate_attendance_sheet.xml
+++ b/beesdoo_shift/wizard/validate_attendance_sheet.xml
@@ -35,7 +35,7 @@
                 <footer>
                     <button type="object"
                         name="validate_sheet"
-                        string="Validate"
+                        string="Comment and validate"
                         class="oe_highlight"
                     />
                     <button type="object" name="save"