diff --git a/Notebooks/Chap13/13_4_Graph_Attention_Networks.ipynb b/Notebooks/Chap13/13_4_Graph_Attention_Networks.ipynb
index 7c33404..a67e829 100644
--- a/Notebooks/Chap13/13_4_Graph_Attention_Networks.ipynb
+++ b/Notebooks/Chap13/13_4_Graph_Attention_Networks.ipynb
@@ -109,7 +109,7 @@
         "# Choose random values for the parameters\n",
         "omega = np.random.normal(size=(D,D))\n",
         "beta = np.random.normal(size=(D,1))\n",
-        "phi = np.random.normal(size=(1,2*D))"
+        "phi = np.random.normal(size=(2*D,1))"
       ],
       "metadata": {
         "id": "79TSK7oLMobe"
@@ -210,4 +210,4 @@
       }
     }
   ]
-}
\ No newline at end of file
+}