Update README.md

README.md

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 ## Introduction
-EmotionThinker is the first RL–enhanced SpeechLLM framework for interpretable speech emotion reasoning.
+EmotionThinker is the first RL–enhanced SpeechLLM framework for interpretable speech emotion reasoning. For details, please refer to the [paper](https://arxiv.org/pdf/2601.15668). 
 
 Unlike conventional speech emotion recognition (SER) systems that treat emotion as a flat classification problem, EmotionThinker reframes SER as a deep reasoning problem, enabling models to jointly produce accurate emotion labels and structured, human-aligned explanations.