diff --git a/notebooks/Block_1/Solutions to Exercises Block 1 - Introduction to Image Classification.ipynb b/notebooks/Block_1/Solutions to Exercises Block 1 - Introduction to Image Classification.ipynb
index 4a39fe9733ce753dbb06083da0c9d3dc2011daed..30c0257d0161d896c46828742a8e4ed02eea8a64 100644
--- a/notebooks/Block_1/Solutions to Exercises Block 1 - Introduction to Image Classification.ipynb	
+++ b/notebooks/Block_1/Solutions to Exercises Block 1 - Introduction to Image Classification.ipynb	
@@ -1349,7 +1349,7 @@
     "    X = X.astype('float')\n",
     "    for i in range(num_test):\n",
     "      for j in range(num_train):\n",
-    "          dists[i, j] = 1 - dot(self.X_train[j,:] , X[i,:])/(norm(self.X_train[j,:])*norm(self.X_train[j,:]))\n",
+    "          dists[i, j] = 1 - dot(self.X_train[j,:] , X[i,:])/(norm(self.X_train[j,:])*norm(self.X_train[i,:]))\n",
     "        \n",
     "    return dists\n",
     "\n",