diff --git a/units/en/unit2/hands-on.mdx b/units/en/unit2/hands-on.mdx
index baddea9..4c201a2 100644
--- a/units/en/unit2/hands-on.mdx
+++ b/units/en/unit2/hands-on.mdx
@@ -261,7 +261,8 @@ print("There are ", action_space, " possible actions")
 ```
 
 ```python
-# Let's create our Qtable of size (state_space, action_space) and initialized each values at 0 using np.zeros
+# 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)
+
 def initialize_q_table(state_space, action_space):
   Qtable =
   return Qtable