diff --git a/htdocs/holiday/card.php b/htdocs/holiday/card.php
index b55c5468a09..26a210f40e0 100644
--- a/htdocs/holiday/card.php
+++ b/htdocs/holiday/card.php
@@ -1283,6 +1283,10 @@ else
                 print '<tr>';
                 print '<td class="nowrap">';
                 $htmlhelp = $langs->trans('NbUseDaysCPHelp');
+                $includesaturday = (isset($conf->global->MAIN_NON_WORKING_DAYS_INCLUDE_SATURDAY) ? $conf->global->MAIN_NON_WORKING_DAYS_INCLUDE_SATURDAY : 1);
+                $includesunday   = (isset($conf->global->MAIN_NON_WORKING_DAYS_INCLUDE_SUNDAY) ? $conf->global->MAIN_NON_WORKING_DAYS_INCLUDE_SUNDAY : 1);
+                if ($includesaturday) $htmlhelp.='<br>'.$langs->trans("DayIsANonWorkingDay", $langs->trans("Saturday"));
+                if ($includesunday) $htmlhelp.='<br>'.$langs->trans("DayIsANonWorkingDay", $langs->trans("Sunday"));
                 print $form->textwithpicto($langs->trans('NbUseDaysCP'), $htmlhelp);
                 print '</td>';
                 print '<td>'.num_open_day($object->date_debut_gmt, $object->date_fin_gmt, 0, 1, $object->halfday).'</td>';
diff --git a/htdocs/langs/en_US/holiday.lang b/htdocs/langs/en_US/holiday.lang
index e30366286fe..82de49f9c5f 100644
--- a/htdocs/langs/en_US/holiday.lang
+++ b/htdocs/langs/en_US/holiday.lang
@@ -39,9 +39,10 @@ TypeOfLeaveId=Type of leave ID
 TypeOfLeaveCode=Type of leave code
 TypeOfLeaveLabel=Type of leave label
 NbUseDaysCP=Number of days of vacation consumed
-NbUseDaysCPHelp=The calculation takes into account the non working days and the holidays defined in the dictionary
+NbUseDaysCPHelp=The calculation takes into account the non working days and the holidays defined in the dictionary.
 NbUseDaysCPShort=Days consumed
 NbUseDaysCPShortInMonth=Days consumed in month
+DayIsANonWorkingDay=%s is a non working day
 DateStartInMonth=Start date in month
 DateEndInMonth=End date in month
 EditCP=Edit