HDFC Bank account holders can link their account with their Aadhaar card. This is must to get direct subsidy from Govt. of India on LPG gas etc.
The procedure to link aadhaar card with HDFC bank is simple.
You just need to download the necessary form, fill it up, attach a copy of aadhaar card with it and visit the nearest branch of HDFC bank with form and original aadhaar card.
You may download the form from here.