HCL in their offer letter stated that notice period is 2 months.But after employee joins they changes it to 3 month silently.
They keep it a low profile and will not inform employees.Then if employee get good rating in appraisal they change notice period to 3 months.I joined HCL 1 year back.After my appraisal I got EE rating and the changed notice period to 3 months to prevent me joining other companies.
So if you perform well HCL HR will cheat you.