diff --git a/ch12/ch12.ipynb b/ch12/ch12.ipynb
index 33071859..6c9fe56a 100644
--- a/ch12/ch12.ipynb
+++ b/ch12/ch12.ipynb
@@ -1296,9 +1296,9 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.1"
+   "version": "3.7.3"
   }
  },
  "nbformat": 4,
- "nbformat_minor": 2
+ "nbformat_minor": 4
 }
diff --git a/ch13/ch13-notebook.ipynb b/ch13/ch13-notebook.ipynb
index 0ed6531a..a65ec96b 100644
--- a/ch13/ch13-notebook.ipynb
+++ b/ch13/ch13-notebook.ipynb
@@ -1,5 +1,16 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "*Python Machine Learning 3rd Edition* by [Sebastian Raschka](https://sebastianraschka.com) & [Vahid Mirjalili](http://vahidmirjalili.com), Packt Publishing Ltd. 2019\n",
+    "\n",
+    "Code Repository: https://github.com/rasbt/python-machine-learning-book-3rd-edition\n",
+    "\n",
+    "Code License: [MIT License](https://github.com/rasbt/python-machine-learning-book-3rd-edition/blob/master/LICENSE.txt)"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -3237,12 +3248,32 @@
     "    print(np.sum(labels_test == 0), np.sum(labels_test == 1), np.sum(labels_test == 2))"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "<br>\n",
+    "<br>\n",
+    "<br>"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "---\n",
+    "\n",
+    "Readers may ignore the next cell."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
    "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    "! python ../.convert_notebook_to_script.py --input ch13.ipynb --output ch13.py"
+   ]
   }
  ],
  "metadata": {