You have to inform CIC as there is a change in your family composition. You would need to do medical and PCC for your wife. You would also need to show additional funds. There won't be recalculation in points but adding these documents would cause a delay. You have to send a CSE to the visa office serving your region if you are outside Canada. If you are in Canada, you can do it online. If you are in India, you would have to get your passports reissued to add spouses name so that you can get a PCC.