diff --git a/units/en/unit5/hands-on.mdx b/units/en/unit5/hands-on.mdx
index a6377dc..5d4c73e 100644
--- a/units/en/unit5/hands-on.mdx
+++ b/units/en/unit5/hands-on.mdx
@@ -143,7 +143,7 @@ You need to create a `SnowballTarget.yaml` config file in ./content/ml-agents/co
 
 We'll give you here a first version of this config (to copy and paste into your `SnowballTarget.yaml file`), **but you should modify it**.
 
-```
+```yaml
 behaviors:
   SnowballTarget:
     trainer_type: ppo