Add comment about RWTH split

README.md

@@ -32,8 +32,7 @@ The model achieves the following results:
 | val   | 6.50    | 19.12   | 1926    |
 | test  | 7.68    | 19.82   | 1965    |
 
-These results were published in [Key-value information extraction from full
-handwritten pages](https://arxiv.org/pdf/2304.13530.pdf).
+A similar model was trained on the RWTH split, corresponding to the results published in [Key-value information extraction from full handwritten pages](https://arxiv.org/pdf/2304.13530.pdf).
 
 Results can be improved by combining PyLaia with a n-gram language model.