JK Rowling's official website has been changed so it can be used by disabled, deaf and visually impaired users.
The site can now be used from a keyboard without a mouse, which will help lots of Potter fans with disabilities.
Web users with sight problems can enlarge the site, and users can also pause movement, switch off noises and look up what sound clues mean.
JK said she was "delighted" that all her fans could now be part of her site.
"www.jk.rowling.com allows me the opportunity to be able to communicate directly with as many Harry Potter fans as possible," JK said. "I am therefore delighted that disabled and visually impaired fans can now be a part of this."
JK's site has lots of interactive elements, and there are lots of pop-ups and sounds which are important to hidden messages and information.
So her improved site means no-one misses out on any of the fun stuff to do.