add arxiv link

README.md

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 This repository provides several enhanced versions of the **PPB-Affinity dataset**, ready for both sequence and structure-based modeling of multi-chain protein-protein interactions. The original PPB-Affinity dataset was introduced in the paper "[PPB-Affinity: Protein-Protein Binding Affinity dataset for AI-based protein drug discovery](https://www.nature.com/articles/s41597-024-03997-4)".
 
-This version of the dataset was prepared for the study: "*Beyond Simple Concatenation: Fairly Assessing PLM Architectures for Multi-Chain Protein-Protein Interactions Prediction*."
+This version of the dataset was prepared for the study: "*[Beyond Simple Concatenation: Fairly Assessing PLM Architectures for Multi-Chain Protein-Protein Interactions Prediction](https://arxiv.org/pdf/2505.20036)*."
 
 The primary enhancements in this repository include:
 * Various levels of data filtration and processing.