diff --git a/Chapter5 - Generalizing Gradient Descent - Learning Multiple Weights at a Time.ipynb b/Chapter5 - Generalizing Gradient Descent - Learning Multiple Weights at a Time.ipynb
index e660a01..f7de76b 100644
--- a/Chapter5 - Generalizing Gradient Descent - Learning Multiple Weights at a Time.ipynb	
+++ b/Chapter5 - Generalizing Gradient Descent - Learning Multiple Weights at a Time.ipynb	
@@ -68,6 +68,8 @@
     "\n",
     "alpha = 0.01\n",
     "\n",
+    "weight_deltas = ele_mul(delta, input)\n",
+    "\n",
     "for i in range(len(weights)):\n",
     "    weights[i] -= alpha * weight_deltas[i]\n",
     "    \n",