Add clarifying statement of previous dataset organization

README.md

@@ -159,7 +159,7 @@ Where, for example, an entry `ds[0]` contains:
 ```
 For more information about Hugging Face datasets, see the [documentation](https://huggingface.co/docs/datasets/loading#hugging-face-hub).
 
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+Previously, data were organized as JPGs in folders named with taxonomic labels.
 To export the data into a format matching the previously used dataset structure, you may do the following without cloning the repository:
 
 1) Create and activate a virtual environment.