diff --git a/addons/hr_payroll/hr_payroll.py b/addons/hr_payroll/hr_payroll.py
index a76daa4e0b0..132d8fc1104 100644
--- a/addons/hr_payroll/hr_payroll.py
+++ b/addons/hr_payroll/hr_payroll.py
@@ -643,7 +643,7 @@ class hr_salary_rule(osv.osv):
         'name':fields.char('Name', size=256, required=True, readonly=False),
         'code':fields.char('Code', size=64, required=True),
         'sequence': fields.integer('Sequence', required=True, help='Use to arrange calculation sequence'),
-        'quantity': fields.char('Quantity', size=256, help="It is used in computation for percentage and fixed amount.For e.g. A rule for Meal Voucher having fixed amount of 1€ can have its quantity defined in expression like worked_days['WORK100']['number_of_days']."),
+        'quantity': fields.char('Quantity', size=256, help="It is used in computation for percentage and fixed amount.For e.g. A rule for Meal Voucher having fixed amount of 1€ per worked day can have its quantity defined in expression like worked_days['WORK100']['number_of_days']."),
         'category_id':fields.many2one('hr.salary.head', 'Salary Head', required=True),
         'active':fields.boolean('Active', help="If the active field is set to false, it will allow you to hide the salary rule without removing it."),
         'appears_on_payslip': fields.boolean('Appears on Payslip', help="Used for the display of rule on payslip"),