diff --git a/notebooks/unit2/unit2.ipynb b/notebooks/unit2/unit2.ipynb
index 90baea8..13a86f0 100644
--- a/notebooks/unit2/unit2.ipynb
+++ b/notebooks/unit2/unit2.ipynb
@@ -511,7 +511,7 @@
       },
       "outputs": [],
       "source": [
-        "# Let's create our Qtable of size (state_space, action_space) and initialized each values at 0 using np.zeros\n",
+        "# Let's create our Qtable of size (state_space, action_space) and initialized each values at 0 using np.zeros. np.zeros needs a tuple (a,b)\n",
         "def initialize_q_table(state_space, action_space):\n",
         "  Qtable = \n",
         "  return Qtable"