Update README.md

README.md

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 # **Reinforce** Agent playing **CartPole-v1**
 This is a trained model of a custom **Reinforce** agent playing **CartPole-v1**.
 
-This was created for [Unit 4](https://huggingface.co/learn/deep-rl-course/unit4/introduction) of the Hugging Face Deep RL Course. I have added some features, such as entropy
-loss, and updating the code for Gymnasium versus the deprecated Gym
+This was created for [Unit 4](https://huggingface.co/learn/deep-rl-course/unit4/introduction) of the Hugging Face Deep RL Course. I have added some features, such as [entropy
+loss](https://www.mathworks.com/help/reinforcement-learning/ug/reinforce-policy-gradient-agents.html), and updating the code for Gymnasium versus the deprecated Gym
 
 Hyperparameters used to train were optimized by [Optuna](https://pypi.org/project/optuna/)