[ask] one year free maintenance

Yesterday, I had my first meeting with a client to develop a website. Everything went well, in term of the requirements and payment. Although the payment is not very high, but it's not underpaid as well.

At the end of the meeting, the client asked me to provide her one year free maintenance. She insisted that it's a common service that is provided by other web service.

I personally haven't had clients that require one year free maintenance. Usually, I gave them time to review the website for one month and see if they want to edit the existing product. But it's not "adding" the product.

My experience with web development is relatively new. Any input will be really appreciated. Thanks!