diff --git a/unit3/unit3.ipynb b/unit3/unit3.ipynb
index 5999413..d353c5f 100644
--- a/unit3/unit3.ipynb
+++ b/unit3/unit3.ipynb
@@ -20,6 +20,8 @@
         "\n",
         "In this notebook, **you'll train a Deep Q-Learning agent** playing Space Invaders using [RL Baselines3 Zoo](https://github.com/DLR-RM/rl-baselines3-zoo), a training framework based on [Stable-Baselines3](https://stable-baselines3.readthedocs.io/en/master/) that provides scripts for training, evaluating agents, tuning hyperparameters, plotting results and recording videos.\n",
         "\n",
+        "We're using the [RL-Baselines-3 Zoo integration, a vanilla version of Deep Q-Learning](https://stable-baselines3.readthedocs.io/en/master/modules/dqn.html) with no extensions such as Double-DQN, Dueling-DQN, and Prioritized Experience Replay.\n",
+        "\n",
         "❓ If you have questions, please post them on #study-group-unit3 discord channel 👉 https://discord.gg/aYka4Yhff9\n",
         "\n",
         "🎮 Environments: \n",