Update README.md

Author: wonjininfo

README.md

@@ -40,6 +40,7 @@ Any researchers who want to collaborate with me on this topic are welcome! To di
 ## How to train/evaluate
 
 For datasets (including biomedical questions), please download them from: [here](https://drive.google.com/file/d/1m0GnVlKqvUHfDdpZ9KDDor5EiIqhPwp3/view?usp=sharing)
+<br>To use the BioASQ dataset, you need to register in [the BioASQ website](http://participants-area.bioasq.org/general_information/general_information_registration/) which authorizes the use of the dataset. 
 
 For example training and evaluation bash script: please see [`train_list_example.sh`](./train_list_example.sh)