Disclaimer for iOS cycle path app

Hi,

I make a app that uses the cycle data from openstreetmaps
https://itunes.apple.com/gb/app/cycle-paths-for-british-isles/id448049851?mt=8

Its a free app I made because I like cycling (and iOS apps!). Its been generally well received however I got one bad review relating to the accuracy of the data.

I was just wondering if anyone has any advice relating to disclaimers (or anything in general about the app)… I dont know much about Legal issues, could I be sued?

Cheers,
Rob