diff --git a/Notebooks/Chap09/9_1_L2_Regularization.ipynb b/Notebooks/Chap09/9_1_L2_Regularization.ipynb
index 93c2bce..bda5af3 100644
--- a/Notebooks/Chap09/9_1_L2_Regularization.ipynb
+++ b/Notebooks/Chap09/9_1_L2_Regularization.ipynb
@@ -341,7 +341,7 @@
       "source": [
         "# Computes the regularization term\n",
         "def compute_reg_term(phi0,phi1):\n",
-        "  # TODO compute the regularization term (term in large brackets in the above equstion)\n",
+        "  # TODO compute the regularization term (term in large brackets in the above equation)\n",
         "  # Replace this line\n",
         "  reg_term = 0.0\n",
         "\n",
@@ -535,4 +535,4 @@
       }
     }
   ]
-}
\ No newline at end of file
+}