Update README.md

Author: sergeyf

README.md

@@ -2,6 +2,7 @@ SmallDatasetBenchmarks
 ======================
 This repo is for testing models on small (classification) datasets.
 
-It uses this dataset: UCI++, a huge collection of preprocessed datasets for supervised classification problems in ARFF format
+It uses a subset of this dataset: UCI++, a huge collection of preprocessed datasets for supervised classification problems in ARFF format
 [![DOI](https://zenodo.org/badge/doi/10.5281/zenodo.13748.svg)](http://dx.doi.org/10.5281/zenodo.13748)
 
+Note that UCI++ reuses the same data in different configurations.