Update README.md

README.md

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 > [Johan Edstedt](https://scholar.google.com/citations?user=Ul-vMR0AAAAJ), [Ioannis Athanasiadis](https://scholar.google.com/citations?user=RCAtJgUAAAAJ), [Mårten Wadenbäck](https://scholar.google.com/citations?user=6WRQpCQAAAAJ), [Michael Felsberg](https://scholar.google.com/citations?&user=lkWfR08AAAAJ)  
 > CVPR 2023
 
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+**WARNING**: DKM is trained on a specific resolution, and is sensitive to the image resolution used. This means that feeding images of a different resolution (higher or lower), may give significantly worse performance. If you're finding DKM to give poor performance, please contact me, it's probably something to do with the input.
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 ## How to Use?
 <details>
 Our model produces a dense (for all pixels) warp and certainty.