diff --git a/locale/sources/point_of_sale.pot b/locale/sources/point_of_sale.pot
index 8a12ade87..3161c7f2f 100644
--- a/locale/sources/point_of_sale.pot
+++ b/locale/sources/point_of_sale.pot
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Odoo Business 9.0\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2016-08-31 15:58+0200\n"
+"POT-Creation-Date: 2016-09-01 11:43+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -1044,11 +1044,11 @@ msgid "Then we add the user who will run the OpenERP server to ``usbusers``"
 msgstr ""
 
 #: ../../point_of_sale/overview/setup.rst:259
-msgid "``# useradd -G usbusers USERNAME``"
+msgid "``# usermod -a -G usbusers USERNAME``"
 msgstr ""
 
 #: ../../point_of_sale/overview/setup.rst:261
-msgid "Then we need to create a udev rule that will automatically allow members of ``usbusers`` to access raw USB devices. To do so create a file called ``99-usbusers.rule`` in the ``/etc/udev/rules.d/`` directory with the following content::"
+msgid "Then we need to create a udev rule that will automatically allow members of ``usbusers`` to access raw USB devices. To do so create a file called ``99-usbusers.rules`` in the ``/etc/udev/rules.d/`` directory with the following content::"
 msgstr ""
 
 #: ../../point_of_sale/overview/setup.rst:269
diff --git a/point_of_sale/overview/setup.rst b/point_of_sale/overview/setup.rst
index d2a1688a8..27a237812 100644
--- a/point_of_sale/overview/setup.rst
+++ b/point_of_sale/overview/setup.rst
@@ -256,11 +256,11 @@ create a group that has access to USB devices
 
 Then we add the user who will run the OpenERP server to ``usbusers``
 
-``# useradd -G usbusers USERNAME``
+``# usermod -a -G usbusers USERNAME``
 
 Then we need to create a udev rule that will automatically allow members
 of ``usbusers`` to access raw USB devices. To do so create a file called
-``99-usbusers.rule`` in the ``/etc/udev/rules.d/`` directory with the
+``99-usbusers.rules`` in the ``/etc/udev/rules.d/`` directory with the
 following content::
 
     SUBSYSTEM=="usb", GROUP="usbusers", MODE="0660"