Update README.md

README.md

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     <a href="https://huggingface.co/collections/Prosho/translation-difficulty-estimators-6816665c008e1d22426eb6c4"><img src="https://img.shields.io/badge/%F0%9F%A4%97%20Hugging%20Face-Collection-FCD21D"></a> &nbsp; &nbsp;
 </div>
 
-This repository contains the **SENTINEL<sub>SRC</sub>** metric model used for Difficulty Sampling at the WMT25 General Machine Translation Shared Task, and analyzed in our paper **Estimating Machine Translation Difficulty**.
+This repository contains the **SENTINEL<sub>SRC</sub>** metric model used for Difficulty Sampling at the [WMT25 General Machine Translation Shared Task](https://www2.statmt.org/wmt25/translation-task.html), and analyzed in our paper **Estimating Machine Translation Difficulty**.
 
 ## Usage