Document new argument

docs/usage/evaluate/index.md

@@ -20,11 +20,12 @@ This will, for each evaluated split:
 
     The display of the worst predictions does not support batch evaluation. If the `training.data.batch_size` parameter is not equal to `1`, then the `WER` displayed is the `WER` of the **whole batch** and not just the image.
 
-| Parameter            | Description                                                                                                                                                                                              | Type           | Default |
-| -------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------- | ------- |
-| `--config`           | Path to the configuration file.                                                                                                                                                                          | `pathlib.Path` |         |
-| `--nerval-threshold` | Distance threshold for the match between gold and predicted entity during Nerval evaluation. `0` would impose perfect matches, `1` would allow completely different strings to be considered as a match. | `float`        | `0.3`   |
-| `--output-json`      | Where to save evaluation results in JSON format.                                                                                                                                                         | `pathlib.Path` | `None`  |
+| Parameter            | Description                                                                                                                                                                                              | Type           | Default                    |
+| -------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------- | -------------------------- |
+| `--config`           | Path to the configuration file.                                                                                                                                                                          | `pathlib.Path` |                            |
+| `--nerval-threshold` | Distance threshold for the match between gold and predicted entity during Nerval evaluation. `0` would impose perfect matches, `1` would allow completely different strings to be considered as a match. | `float`        | `0.3`                      |
+| `--output-json`      | Where to save evaluation results in JSON format.                                                                                                                                                         | `pathlib.Path` | `None`                     |
+| `--sets`             | Which sets should be evaluated.                                                                                                                                                                          | `str`          | `["train", "val", "test"]` |
 
 ## Examples