I've heard that if you've had 2 c-sections, you can't go through a normal delivery for your 3rd baby. Is this true?

I personally had this experience when I had my 3rd child. My first 2 were c sections. I did ask my gynae then if I could still opt for natural. She said that as a gynae she could only advise me on the risks if I were to insist on natural. They had already cut me up twice and hence there is a high possibility that the wound/cut area will tear during labour. Which is not ideal. We chose c section in the end. :)