Update README.md

README.md

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 We share in this repo the MITRE ATT&CK mapping datasets, with `training`, `validation` and `test` splits. 
 The datasets can be considered as an emerging and challenging `multilabel classification` NLP task, with over 600 hierarchical classes.
 
+NOTE: due to their security nature, these datasets contain textual information about `malware` and other security aspects.
+
 ## Datasets
 
 ### TRAM