diff --git a/docs/TRAINING_MULTIPLE_POLICIES.md b/docs/TRAINING_MULTIPLE_POLICIES.md
index 342189d..9c5b353 100644
--- a/docs/TRAINING_MULTIPLE_POLICIES.md
+++ b/docs/TRAINING_MULTIPLE_POLICIES.md
@@ -8,6 +8,8 @@ This is a brief guide on training multiple policies focusing on Rllib specifical
 
 `pip install ray[rllib]<=2.38.0`
 
+`pip install onnx==1.16.1`
+
 `pip install PettingZoo`
 
 ### Download the examples file and config file: