Update README.md

README.md

@@ -39,7 +39,8 @@ The dataset is provided in **Parquet format** and contains the following columns
 |------------------------------|-------------------|-----------------------------------------------------------------------------|
 | `chunk_id`                   | `str`             | Unique source based identifier of the chunk                                 |
 | `title`                      | `str`             | Title of the dataset.                                                       |
-| `slug`                       | `str`             | Slug (URL-friendly identifier of the dataset).                              |
+| `doc_id`                     | `str`             | Document identifier from the source site (slug).                            |
+| `chunk_xxh64`                | `str`             | XXH64 hash of the `chunk_text` value.                                       |
 | `acronym`                    | `str`             | Acronym of the dataset (if available).                                      |
 | `url`                        | `str`             | URL of the dataset on data.gouv.fr.                                         |
 | `organization`               | `str`             | Name of the associated organization.                                        |