diff --git a/docs/tutorials/sb3/connect_four.md b/docs/tutorials/sb3/connect_four.md
index eef34deac..92d865ff3 100644
--- a/docs/tutorials/sb3/connect_four.md
+++ b/docs/tutorials/sb3/connect_four.md
@@ -11,7 +11,7 @@ title: "SB3: Action Masked PPO for Connect Four"
 
 ```
 
-This tutorial shows how to train a agents using Maskable [Proximal Policy Optimization](https://sb3-contrib.readthedocs.io/en/master/modules/ppo_mask.html) (PPO) on the [Connect Four](/environments/classic/chess/) environment ([AEC](/api/aec/)).
+This tutorial shows how to train a agents using Maskable [Proximal Policy Optimization](https://sb3-contrib.readthedocs.io/en/master/modules/ppo_mask.html) (PPO) on the [Connect Four](/environments/classic/connect_four/) environment ([AEC](/api/aec/)).
 
 It creates a custom Wrapper to convert to a [Gymnasium](https://gymnasium.farama.org/)-like environment which is compatible with [SB3 action masking](https://sb3-contrib.readthedocs.io/en/master/modules/ppo_mask.html).