Apostile simply means that you need to get the documents registered in your state (the one you are residing currently in the USA) secretary’s office. There is a memorandum signed between Indian and US government (Hague Convention) which makes the documents 'Apostiled' in the USA legally valid and acceptable in Indian courts. You have to look for this process in your specific state’s secretary’s office. It is pretty easy and you can either walk-in or mail your documents for Apostile. You may need to take a prior appointment in the secretary’s office if you are thinking of walking in.