diff --git a/account_usability/__init__.py b/account_usability/__init__.py
index 0b72ffe..be026e1 100644
--- a/account_usability/__init__.py
+++ b/account_usability/__init__.py
@@ -2,3 +2,4 @@
 
 from . import account
 from . import partner
+from . import wizard
diff --git a/account_usability/__manifest__.py b/account_usability/__manifest__.py
index 8413f22..94b247e 100644
--- a/account_usability/__manifest__.py
+++ b/account_usability/__manifest__.py
@@ -33,6 +33,7 @@ This module has been written by Alexis de Lattre from Akretion <alexis.delattre@
     'data': [
         'account_view.xml',
         'partner_view.xml',
+        'wizard/account_invoice_mark_sent_view.xml',
         ],
     'installable': True,
 }
diff --git a/account_usability/account.py b/account_usability/account.py
index 82501a0..7045372 100644
--- a/account_usability/account.py
+++ b/account_usability/account.py
@@ -6,7 +6,6 @@
 from odoo import models, fields, api, _
 from odoo.tools import float_compare, float_is_zero
 from odoo.exceptions import UserError
-from itertools import groupby
 
 
 class AccountInvoice(models.Model):
@@ -79,8 +78,8 @@ class AccountInvoice(models.Model):
     # generated from customer invoices linked to the partners' account because:
     # 1) the label of an account move line is an important field, we can't
     #    write a rubbish '/' in it !
-    # 2) the 'name' field of the account.move.line is used in the overdue letter,
-    # and '/' is not meaningful for our customer !
+    # 2) the 'name' field of the account.move.line is used in the overdue
+    # letter, and '/' is not meaningful for our customer !
     @api.multi
     def action_move_create(self):
         res = super(AccountInvoice, self).action_move_create()
@@ -134,8 +133,10 @@ class AccountJournal(models.Model):
             return res
         else:
             for journal in self:
-                currency = journal.currency_id or journal.company_id.currency_id
-                name = "[%s] %s (%s)" % (journal.code, journal.name, currency.name)
+                currency = journal.currency_id or\
+                    journal.company_id.currency_id
+                name = "[%s] %s (%s)" % (
+                    journal.code, journal.name, currency.name)
                 res.append((journal.id, name))
             return res
 
@@ -193,8 +194,8 @@ class AccountAnalyticAccount(models.Model):
 class AccountMove(models.Model):
     _inherit = 'account.move'
 
-    default_move_line_name = fields.Char(string='Default Label',
-        states={'posted': [('readonly', True)]})
+    default_move_line_name = fields.Char(
+        string='Default Label', states={'posted': [('readonly', True)]})
     # By default, we can still modify "ref" when account move is posted
     # which seems a bit lazy for me...
     ref = fields.Char(states={'posted': [('readonly', True)]})
@@ -303,7 +304,7 @@ class AccountBankStatementLine(models.Model):
     # is caused by this.
     # Set search_reconciliation_proposition to False by default
     # TODO: re-write in v10
-    #def get_data_for_reconciliations(
+    # def get_data_for_reconciliations(
     #        self, cr, uid, ids, excluded_ids=None,
     #        search_reconciliation_proposition=False, context=None):
     #    # Make variable name shorted for PEP8 !
@@ -323,8 +324,8 @@ class AccountBankStatementLine(models.Model):
         # 2) The name of the statement line is already written in the name of
         # the move line -> not useful to have the info 2 times
         # In the end, I think it's better to just put nothing (we could write
-        # the name of the statement which has the account number, but it doesn't
-        # bring any useful info to the accountant)
+        # the name of the statement which has the account number, but it
+        # doesn't bring any useful info to the accountant)
         # The only "good" thing to do would be to have a sequence per
         # statement line and write it in this 'ref' field
         # But that would required an additionnal field on statement lines
diff --git a/account_usability/wizard/__init__.py b/account_usability/wizard/__init__.py
new file mode 100644
index 0000000..553832c
--- /dev/null
+++ b/account_usability/wizard/__init__.py
@@ -0,0 +1,3 @@
+# -*- encoding: utf-8 -*-
+
+from . import account_invoice_mark_sent
diff --git a/account_usability/wizard/account_invoice_mark_sent.py b/account_usability/wizard/account_invoice_mark_sent.py
new file mode 100644
index 0000000..baee066
--- /dev/null
+++ b/account_usability/wizard/account_invoice_mark_sent.py
@@ -0,0 +1,23 @@
+# -*- coding: utf-8 -*-
+# © 2017 Akretion (Alexis de Lattre <alexis.delattre@akretion.com>)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from openerp import models
+import logging
+logger = logging.getLogger(__name__)
+
+
+class AccountInvoiceMarkSent(models.TransientModel):
+    _name = 'account.invoice.mark.sent'
+    _description = 'Mark invoices as sent'
+
+    def run(self):
+        assert self.env.context.get('active_model') == 'account.invoice',\
+            'Source model must be invoices'
+        assert self.env.context.get('active_ids'), 'No invoices selected'
+        invoices = self.env['account.invoice'].search([
+            ('id', 'in', self.env.context.get('active_ids')),
+            ('state', 'in', ('open', 'paid'))])
+        invoices.write({'sent': True})
+        logger.info('Marking invoices with ID %s as sent', invoices.ids)
+        return
diff --git a/account_usability/wizard/account_invoice_mark_sent_view.xml b/account_usability/wizard/account_invoice_mark_sent_view.xml
new file mode 100644
index 0000000..edbd7af
--- /dev/null
+++ b/account_usability/wizard/account_invoice_mark_sent_view.xml
@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    © 2017 Akretion (Alexis de Lattre <alexis.delattre@akretion.com>)
+    The licence is in the file __openerp__.py
+-->
+
+<odoo>
+
+<record id="account_invoice_mark_sent_form" model="ir.ui.view">
+    <field name="name">account.invoice.mark.sent.form</field>
+    <field name="model">account.invoice.mark.sent</field>
+    <field name="arch"  type="xml">
+        <form string="Mark invoices as sent">
+            <p>
+                This wizard will mark as <i>sent</i> all the selected invoices in open or paid state.
+            </p>
+            <footer>
+                <button type="object" name="run" string="Mark as Sent" class="btn-primary"/>
+                <button special="cancel" string="Cancel" class="oe_link"/>
+            </footer>
+        </form>
+    </field>
+</record>
+
+<act_window id="account_invoice_mark_sent_action"
+            multi="True"
+            key2="client_action_multi"
+            name="Mark as Sent"
+            res_model="account.invoice.mark.sent"
+            src_model="account.invoice"
+            view_mode="form"
+            target="new"
+            groups="account.group_account_invoice" />
+
+</odoo>