diff --git a/addons/hr_payroll/hr_payroll.py b/addons/hr_payroll/hr_payroll.py
index 16189def579..11c08db580f 100644
--- a/addons/hr_payroll/hr_payroll.py
+++ b/addons/hr_payroll/hr_payroll.py
@@ -638,7 +638,7 @@ class hr_salary_rule(osv.osv):
     _name = 'hr.salary.rule'
     _columns = {
         'name':fields.char('Name', size=256, required=True, readonly=False),
-        'code':fields.char('Code', size=64, required=True, help="Code is case sensitive."),
+        'code':fields.char('Code', size=64, required=True, help="The code of salary rules can be used as reference in computation of other rules. In that case, it is case sensitive."),
         'sequence': fields.integer('Sequence', required=True, help='Use to arrange calculation sequence'),
         '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."),