diff --git a/addons/laundry_management/models/account_move.py b/addons/laundry_management/models/account_move.py
new file mode 100644
index 0000000..694e2b0
--- /dev/null
+++ b/addons/laundry_management/models/account_move.py
@@ -0,0 +1,21 @@
+from odoo import models, fields, api
+
+
+class AccountMoveLaundryExt(models.Model):
+    """Flag invoices originating from laundry orders."""
+    _inherit = 'account.move'
+
+    is_laundry_invoice = fields.Boolean(
+        string='Laundry Invoice',
+        compute='_compute_is_laundry_invoice',
+        store=True,
+    )
+
+    @api.depends('invoice_line_ids.sale_line_ids.order_id.is_laundry_order')
+    def _compute_is_laundry_invoice(self):
+        for move in self:
+            move.is_laundry_invoice = any(
+                sol.order_id.is_laundry_order
+                for line in move.invoice_line_ids
+                for sol in line.sale_line_ids
+            )