Changing BA flight dates

[tontoro]

I'm just looking at a flight to Chicago in the BA january sale. The price is good, but I don't actually know for sure the dates I want (80% certain).

According to this page

https://www.britishairways.com/travel/service-fees...

It will not cost anything, other than any fare difference, to amend the booking. Is this correct, or will they get me some other way if I do want to change?

[tontoro]

Thanks