diff --git a/graphs_trees/bst/bst.py b/graphs_trees/bst/bst.py
index 87c1a00..b95fe2f 100644
--- a/graphs_trees/bst/bst.py
+++ b/graphs_trees/bst/bst.py
@@ -17,14 +17,13 @@ class Bst(object):
 
     def insert(self, data):
         if data is None:
-            raise Exception('Data cannot be None')
+            raise TypeError('data cannot be None')
         if self.root is None:
             self.root = Node(data)
             return self.root
         return self._insert(self.root, data)
 
     def _insert(self, node, data):
-        # Constraint: Assume we are working with valid ints
         if node is None:
             return Node(data)
         if data <= node.data:
diff --git a/graphs_trees/bst/bst_solution.ipynb b/graphs_trees/bst/bst_solution.ipynb
index fd42d3f..e58af89 100644
--- a/graphs_trees/bst/bst_solution.ipynb
+++ b/graphs_trees/bst/bst_solution.ipynb
@@ -132,14 +132,13 @@
     "\n",
     "    def insert(self, data):\n",
     "        if data is None:\n",
-    "            raise Exception('Data cannot be None')\n",
+    "            raise TypeError('data cannot be None')\n",
     "        if self.root is None:\n",
     "            self.root = Node(data)\n",
     "            return self.root\n",
     "        return self._insert(self.root, data)\n",
     "\n",
     "    def _insert(self, node, data):\n",
-    "        # Constraint: Assume we are working with valid ints\n",
     "        if node is None:\n",
     "            return Node(data)\n",
     "        if data <= node.data:\n",