diff --git a/stacks-queues/hanoi.ipynb b/stacks-queues/hanoi.ipynb
index 95d3594..dc2a6e8 100644
--- a/stacks-queues/hanoi.ipynb
+++ b/stacks-queues/hanoi.ipynb
@@ -1,5 +1,12 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "<small><i>This notebook was prepared by [Donne Martin](http://donnemartin.com). Source and license info is on [GitHub](https://bit.ly/code-notes).</i></small>"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -132,7 +139,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython2",
-   "version": "2.7.9"
+   "version": "2.7.10"
   }
  },
  "nbformat": 4,
diff --git a/stacks-queues/n-stacks.ipynb b/stacks-queues/n-stacks.ipynb
index 120e1cf..3c96414 100644
--- a/stacks-queues/n-stacks.ipynb
+++ b/stacks-queues/n-stacks.ipynb
@@ -1,5 +1,12 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "<small><i>This notebook was prepared by [Donne Martin](http://donnemartin.com). Source and license info is on [GitHub](https://bit.ly/code-notes).</i></small>"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -175,7 +182,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython2",
-   "version": "2.7.9"
+   "version": "2.7.10"
   }
  },
  "nbformat": 4,
diff --git a/stacks-queues/queue-from-stacks.ipynb b/stacks-queues/queue-from-stacks.ipynb
index 2c0734f..caddd96 100644
--- a/stacks-queues/queue-from-stacks.ipynb
+++ b/stacks-queues/queue-from-stacks.ipynb
@@ -1,5 +1,12 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "<small><i>This notebook was prepared by [Donne Martin](http://donnemartin.com). Source and license info is on [GitHub](https://bit.ly/code-notes).</i></small>"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -167,7 +174,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython2",
-   "version": "2.7.9"
+   "version": "2.7.10"
   }
  },
  "nbformat": 4,
diff --git a/stacks-queues/queue-list.ipynb b/stacks-queues/queue-list.ipynb
index 4ac8107..ea87447 100644
--- a/stacks-queues/queue-list.ipynb
+++ b/stacks-queues/queue-list.ipynb
@@ -1,5 +1,12 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "<small><i>This notebook was prepared by [Donne Martin](http://donnemartin.com). Source and license info is on [GitHub](https://bit.ly/code-notes).</i></small>"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -212,7 +219,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython2",
-   "version": "2.7.9"
+   "version": "2.7.10"
   }
  },
  "nbformat": 4,
diff --git a/stacks-queues/set-of-stacks.ipynb b/stacks-queues/set-of-stacks.ipynb
index 4a6b1a3..9e8d4b9 100644
--- a/stacks-queues/set-of-stacks.ipynb
+++ b/stacks-queues/set-of-stacks.ipynb
@@ -1,5 +1,12 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "<small><i>This notebook was prepared by [Donne Martin](http://donnemartin.com). Source and license info is on [GitHub](https://bit.ly/code-notes).</i></small>"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -182,7 +189,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython2",
-   "version": "2.7.9"
+   "version": "2.7.10"
   }
  },
  "nbformat": 4,
diff --git a/stacks-queues/sort-stack.ipynb b/stacks-queues/sort-stack.ipynb
index 7f7cc02..81c370d 100644
--- a/stacks-queues/sort-stack.ipynb
+++ b/stacks-queues/sort-stack.ipynb
@@ -1,5 +1,12 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "<small><i>This notebook was prepared by [Donne Martin](http://donnemartin.com). Source and license info is on [GitHub](https://bit.ly/code-notes).</i></small>"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -137,7 +144,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython2",
-   "version": "2.7.9"
+   "version": "2.7.10"
   }
  },
  "nbformat": 4,
diff --git a/stacks-queues/stack-min.ipynb b/stacks-queues/stack-min.ipynb
index 963e58d..e9e73a7 100644
--- a/stacks-queues/stack-min.ipynb
+++ b/stacks-queues/stack-min.ipynb
@@ -1,5 +1,12 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "<small><i>This notebook was prepared by [Donne Martin](http://donnemartin.com). Source and license info is on [GitHub](https://bit.ly/code-notes).</i></small>"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -166,7 +173,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython2",
-   "version": "2.7.9"
+   "version": "2.7.10"
   }
  },
  "nbformat": 4,
diff --git a/stacks-queues/stack.ipynb b/stacks-queues/stack.ipynb
index f9d83ee..7148988 100644
--- a/stacks-queues/stack.ipynb
+++ b/stacks-queues/stack.ipynb
@@ -1,5 +1,12 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "<small><i>This notebook was prepared by [Donne Martin](http://donnemartin.com). Source and license info is on [GitHub](https://bit.ly/code-notes).</i></small>"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -237,7 +244,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython2",
-   "version": "2.7.9"
+   "version": "2.7.10"
   }
  },
  "nbformat": 4,