Please refer to Paragraphs 33 & 61(1) under The Employees' Provident Fund Scheme, 1952, and Paragraph 18 of the Employees' Pension Scheme, 1995. It is mentioned in these paragraphs to submit Declaration/Nomination Form No. 2 to confer the right to receive the withdrawal/pension benefit in the event of his death, which itself states that the submission of the form is mandatory.
Secondly, these details will help update Form 9, which is essential for the PF department to process your claim.
Regards,
Janardan