diff --git a/units/en/unit5/snowball-target.mdx b/units/en/unit5/snowball-target.mdx
index 21364b1..9b73e91 100644
--- a/units/en/unit5/snowball-target.mdx
+++ b/units/en/unit5/snowball-target.mdx
@@ -2,6 +2,8 @@
 
 <img src="https://huggingface.co/datasets/huggingface-deep-rl-course/course-images/resolve/main/en/unit5/snowballtarget.gif" alt="SnowballTarget"/>
 
+SnowballTarget is the environment we created at Hugging Face, and the assets are from [Kay Lousberg](https://kaylousberg.com/). We have an optional section at the end of this Unit **if you want to learn to use Unity and create your environments**.
+
 ## The agent's Goal
 
 The first agent you're going to train is Julien the bear 🐻 (the name is based after our [CTO Julien Chaumond](https://twitter.com/julien_c)) **to hit targets with snowballs**.