diff --git a/not_so_obvious_python_stuff.ipynb b/not_so_obvious_python_stuff.ipynb
index 514778f..7dc2ad4 100644
--- a/not_so_obvious_python_stuff.ipynb
+++ b/not_so_obvious_python_stuff.ipynb
@@ -1,7 +1,7 @@
 {
  "metadata": {
   "name": "",
-  "signature": "sha256:6bc56360203df31596f6332e4b5c73effb2572d18b60bdf6a792042e2fde8c12"
+  "signature": "sha256:158ad35cd56abe8905983dc63421b3b7b54d28a947df54f67a3b7f0a53e31481"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -42,7 +42,8 @@
       "- [`True` and `False` in the datetime module](#datetime_module)\n",
       "- [Python reuses objects for small integers](#python_small_int)\n",
       "- [Shallow vs. deep copies if list contains other structures and objects](#shallow_vs_deep)\n",
-      "- [Picking True values from and and or expressions](#false_true_expressions)"
+      "- [Picking True values from and and or expressions](#false_true_expressions)\n",
+      "- [Don't use mutable objects as default arguments for functions!](#def_mutable_func)"
      ]
     },
     {
@@ -335,7 +336,7 @@
      "source": [
       "<br>\n",
       "<br>\n",
-      "<a name='def_mutable_func></a>\n",
+      "<a name='def_mutable_func'></a>\n",
       "## Don't use mutable objects as default arguments for functions!"
      ]
     },