diff --git a/Notebooks/Chap03/3_3_Shallow_Network_Regions.ipynb b/Notebooks/Chap03/3_3_Shallow_Network_Regions.ipynb
index 53a2b86..6f45ebf 100644
--- a/Notebooks/Chap03/3_3_Shallow_Network_Regions.ipynb
+++ b/Notebooks/Chap03/3_3_Shallow_Network_Regions.ipynb
@@ -79,7 +79,7 @@
       "source": [
         "def number_regions(Di, D):\n",
         "  # TODO -- implement Zaslavsky's formula\n",
-        "  # You can use math.com() https://www.w3schools.com/python/ref_math_comb.asp\n",
+        "  # You can use math.comb() https://www.w3schools.com/python/ref_math_comb.asp\n",
         "  # Replace this code\n",
         "  N = 1;\n",
         "\n",
@@ -256,4 +256,4 @@
       "outputs": []
     }
   ]
-}
\ No newline at end of file
+}