The Queen's granddaughter, Princess Beatrice, is dyslexic - and she thinks it's important that people should know about the literacy problem.
Beatrice's mother, the Duchess Of York, said that her daughter was having help with her reading and writing skills.
"She said 'Please tell everybody because it's very important'," the Duchess revealed.
Beatrice is taking her GCSEs in the summer. About one in 10 people are affected by dyslexia.
Most of them have difficulty recognising, reading and spelling words.
The Duchess was speaking as part of her work for a charity called Springboard For Children, which sends volunteers to city schools to help pupils who are behind in their reading and writing.
She revealed that she too was "a little bit" dyslexic and experienced some problems at school.