Update README.md

Added extra information about the model

README.md

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 - text: "El síndrome de dolor regional complejo es un trastorno de dolor crónico."
 
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 # bert-base-spanish-wwm-uncased-finetuned-NER-medical
 
-This model is a fine-tuned version of [dccuchile/bert-base-spanish-wwm-uncased](https://huggingface.co/dccuchile/bert-base-spanish-wwm-uncased) on an adaptation of eHealth-KD Challenge 2020 dataset (filtered only for the task of NER). The dataset annotations for NER are ['Concept', 'Action', 'Predicate', 'Reference'].
+This model is a fine-tuned version of [dccuchile/bert-base-spanish-wwm-uncased](https://huggingface.co/dccuchile/bert-base-spanish-wwm-uncased) on an adaptation of [eHealth-KD Challenge 2020 dataset](https://knowledge-learning.github.io/ehealthkd-2020/), filtered only for the task of NER. The dataset annotations for NER are ['Concept', 'Action', 'Predicate', 'Reference']. 
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+Before the training process, the dataset had processed to label it with the BIO annotation format. Some cleaning and adaptations were needed, for example, to work with overlapped entities. 
 
 
 It achieves the following results on the evaluation set:
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 ## Training procedure
 
+The chapter  [“Token classification”]( https://huggingface.co/course/chapter7/2) in the Hugging Face online course was used as starting point for the training process. We made some adaptions because our dataset follows a slightly different structure. Moreover, a conversion between string labels and integers labels was needed.
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 ### Training hyperparameters
 
 The following hyperparameters were used during training: