Update README.md

README.md

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 # Cross-Encoder
 
+The model can be used for Information Retrieval: given a query, encode the query will all possible passages. Then sort the passages in a decreasing order.
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 <p align="center">
     <img src="https://www.exibart.com/repository/media/2020/07/bridget-riley-cool-edge.jpg" width="400"> </br>
     Bridget Riley, COOL EDGE
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 ## Training Data
 
-This model was trained on a custom ranking dataset. 
+This model was trained on a custom biomedical q&a ranking dataset.
 
 ## Usage and Performance