Update README.md

README.md

@@ -25,6 +25,7 @@ This is a trained model of a **A2C** agent playing **AntBulletEnv-v0**
 using the [stable-baselines3 library](https://github.com/DLR-RM/stable-baselines3).
 
 ## Usage (with Stable-baselines3)
+## parameters
 
 ```python
 model = A2C(policy = "MlpPolicy",