Update README.md

README.md

@@ -6666,7 +6666,8 @@ is a large benchmark dataset compiled from 50 published resources
 different experimental references/measurements. This dataset was
 [published in Scientific Data](https://www.nature.com/articles/s41597-021-01069-5) and
 a mirror of the [theochem/B3DB](https://github.com/theochem/B3DB) the official Github repo where it is
-occasionally uploaded with new experimental data. Scientists who would like
+occasionally uploaded with new experimental data. We used the original datasets uploaded in 2023 (regression datasets)
+and 2021 (classification datasets). Scientists who would like
 to contribute data should contact the database's maintainers (e.g., by creating a
 [new Issue](https://github.com/theochem/B3DB/issues) in the database).