Change default port other than 5000

In the chapter 1, driver setup readme, it says:
If you need to run on a port other than 5000, you can edit the index.html file in the build directory to modify the value of window.host .

I tried to verify the /mflix-python/mflix/build/index.html and the included /static/js/main.773a0f83.js file, but didn’t get the exact clue where I can change the port other than 5000. Can someone help please ?

In run.py, change app.run() to app.run(port=8080).

Thanks Dear for the help. I think that above mentioned text can be removed from readme to avoid further confusion.