diff --git a/__init__.py b/__init__.py
index 26b3eceddd..fdb2cbde7e 100644
--- a/__init__.py
+++ b/__init__.py
@@ -1,5 +1,5 @@
-#This file is part of Tryton.  The COPYRIGHT file at the top level of
-#this repository contains the full copyright notices and license terms.
+# This file is part of Tryton.  The COPYRIGHT file at the top level of
+# this repository contains the full copyright notices and license terms.
 
 from trytond.pool import Pool
 from .purchase import *
diff --git a/invoice.py b/invoice.py
index d30c64d725..9d5317cdb8 100644
--- a/invoice.py
+++ b/invoice.py
@@ -1,5 +1,5 @@
-#This file is part of Tryton.  The COPYRIGHT file at the top level
-#of this repository contains the full copyright notices and license terms.
+# This file is part of Tryton.  The COPYRIGHT file at the top level of
+# this repository contains the full copyright notices and license terms.
 from trytond.pool import Pool, PoolMeta
 
 __all__ = ['InvoiceLine']
diff --git a/purchase.py b/purchase.py
index 355df42e62..48665011bd 100644
--- a/purchase.py
+++ b/purchase.py
@@ -1,5 +1,5 @@
-#This file is part of Tryton.  The COPYRIGHT file at the top level
-#of this repository contains the full copyright notices and license terms.
+# This file is part of Tryton.  The COPYRIGHT file at the top level of
+# this repository contains the full copyright notices and license terms.
 from sql import Table
 from sql.functions import Overlay, Position
 
diff --git a/setup.py b/setup.py
index 9ab09ca4ae..05344e9cb1 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
-#This file is part of Tryton.  The COPYRIGHT file at the top level of
-#this repository contains the full copyright notices and license terms.
+# This file is part of Tryton.  The COPYRIGHT file at the top level of
+# this repository contains the full copyright notices and license terms.
 
 from setuptools import setup
 import re
diff --git a/tests/__init__.py b/tests/__init__.py
index 544f41f7ae..2b3485efd5 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1,5 +1,5 @@
-#This file is part of Tryton.  The COPYRIGHT file at the top level of
-#this repository contains the full copyright notices and license terms.
+# This file is part of Tryton.  The COPYRIGHT file at the top level of
+# this repository contains the full copyright notices and license terms.
 
 from .test_purchase_invoice_line_standalone import suite
 
diff --git a/tests/test_purchase_invoice_line_standalone.py b/tests/test_purchase_invoice_line_standalone.py
index 18a5461189..fe8599840d 100644
--- a/tests/test_purchase_invoice_line_standalone.py
+++ b/tests/test_purchase_invoice_line_standalone.py
@@ -1,5 +1,5 @@
-#This file is part of Tryton.  The COPYRIGHT file at the top level of
-#this repository contains the full copyright notices and license terms.
+# This file is part of Tryton.  The COPYRIGHT file at the top level of
+# this repository contains the full copyright notices and license terms.
 import unittest
 import doctest
 import trytond.tests.test_tryton