diff --git a/RLLib_training/README.md b/RLLib_training/README.md
index 7b48f579c8da6323804841608057419c71a27ba6..1a7e5b82c7384c2924fc8ac738b4eace17043c19 100644
--- a/RLLib_training/README.md
+++ b/RLLib_training/README.md
@@ -5,6 +5,7 @@ This repository allows to run Rail Environment multi agent training with the RLL
 pip install gym
 pip install ray
 pip install gin-config
+pip install opencv-python
 ```
 
 To start a training with different parameters, you can create a folder containing a config.gin file (see example in `experiment_configs/config_example/config.gin`.