diff --git a/ProgrammingAssignment_1/model.ipynb b/ProgrammingAssignment_1/model.ipynb
index 48316f283e18f40d6072589ecfccf3f3654d5cb2..f00acf17254f35dd3ea3eec958fe3c710a83d956 100644
--- a/ProgrammingAssignment_1/model.ipynb
+++ b/ProgrammingAssignment_1/model.ipynb
@@ -123,11 +123,11 @@
     "        dist: float\n",
     "    '''\n",
     "if metric == 'Euclidean':\n",
-    "   raise NotImplementedError",
+    "       raise NotImplementedError",
     "elif metric == 'Manhattan':\n",
-    "   raise NotImplementedError\n",
+    "       raise NotImplementedError\n",
     "else:\n",
-    "   raise ValueError('{} is not a valid metric.'.format(metric))\n",
+    "       raise ValueError('{} is not a valid metric.'.format(metric))\n",
     "   return dist # scalar distance btw x and y"
    ]
   },