diff --git a/TFv2/ch02/Listing 2.09.ipynb b/TFv2/ch02/Listing 2.09.ipynb
index 2b9b488..af36875 100644
--- a/TFv2/ch02/Listing 2.09.ipynb	
+++ b/TFv2/ch02/Listing 2.09.ipynb	
@@ -42,7 +42,7 @@
     "\n",
     "for i in range(1, len(raw_data)):\n",
     "    if raw_data[i] - raw_data[i-1] > 5:\n",
-    "        updater = spike.assign(True)\n",
+    "        spike.assign(True)\n",
     "    else:\n",
     "        spike.assign(False)\n",
     "    print(\"Spike\", spike.numpy())"