Update README.md

Updated the README.md by referencing the snap shot of the catalogs that was used for annotation.

README.md

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 This dataset is designed to train and evaluate models for detecting sustainability criteria in Swiss public procurement documents (Call for Tenders, CFT). The dataset classifies text segments based on whether they contain specific sustainability requirements according to official Swiss guidelines.
 
+These annotations are based on a specific snapshot of the sustainability procurement criteria catalogs available at [IntelliProcure/sustainability_criteria](https://huggingface.co/datasets/IntelliProcure/sustainability_criteria). However, to ensure consistency and reproducibility with the **SwissSPARK** annotations, users are advised to use this specific snapshot of the criteria catalogs: [IntelliProcure/SwissSPARK_Catalogs](https://huggingface.co/datasets/IntelliProcure/SwissSPARK_Catalogs). Newer versions of the catalogs may contain changes that differ from the guidelines used during the annotation of this dataset.
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 ### Dataset Summary
 
 - **Language:** German (de)