diff --git a/.ipynb_checkpoints/not_so_obvious_python_stuff-checkpoint.ipynb b/.ipynb_checkpoints/not_so_obvious_python_stuff-checkpoint.ipynb
index 21f338e..154d7d8 100644
--- a/.ipynb_checkpoints/not_so_obvious_python_stuff-checkpoint.ipynb
+++ b/.ipynb_checkpoints/not_so_obvious_python_stuff-checkpoint.ipynb
@@ -1,7 +1,7 @@
 {
  "metadata": {
   "name": "",
-  "signature": "sha256:437ca0df14a08cf4fd584f91122010286928f287ae14c5ac1ce8230abe9dbf9a"
+  "signature": "sha256:43a74f5daf674621e35388775c4372dd9587ddf80df1e26c2c8301ae66424581"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -13,7 +13,9 @@
      "metadata": {},
      "source": [
       "Sebastian Raschka  \n",
-      "last updated: 04/15/2014"
+      "last updated: 04/15/2014\n",
+      "\n",
+      "[Link to this IPython Notebook on GitHub](https://github.com/rasbt/python_reference/blob/master/not_so_obvious_python_stuff.ipynb)"
      ]
     },
     {
@@ -38,7 +40,7 @@
       "- [The C3 class resolution algorithm for multiple class inheritance](#c3_class_res)\n",
       "- [The behavior of += for lists](#pm_in_lists)\n",
       "- [`True` and `False` in the datetime module](#datetime_module)\n",
-      "- [Some Python Oddity that I cannot explain, yet](#python_oddity)\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)"
      ]
@@ -186,8 +188,10 @@
      "source": [
       "<br>\n",
       "<br>\n",
-      "<a name='python_oddity'></a>\n",
-      "## Some Python Oddity that I cannot explain, yet"
+      "<a name='python_small_int'></a>\n",
+      "## Python reuses objects for small integers \n",
+      "\n",
+      "This oddity occurs, because Python tends to stores small integers as the same object, but not so for larger ones!"
      ]
     },
     {
diff --git a/not_so_obvious_python_stuff.ipynb b/not_so_obvious_python_stuff.ipynb
index 1d0646c..154d7d8 100644
--- a/not_so_obvious_python_stuff.ipynb
+++ b/not_so_obvious_python_stuff.ipynb
@@ -1,7 +1,7 @@
 {
  "metadata": {
   "name": "",
-  "signature": "sha256:466467169d92398c710c1b7969b363ee4c4d32dcf96afa519dd8fb9162785cc4"
+  "signature": "sha256:43a74f5daf674621e35388775c4372dd9587ddf80df1e26c2c8301ae66424581"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -40,7 +40,7 @@
       "- [The C3 class resolution algorithm for multiple class inheritance](#c3_class_res)\n",
       "- [The behavior of += for lists](#pm_in_lists)\n",
       "- [`True` and `False` in the datetime module](#datetime_module)\n",
-      "- [Some Python Oddity that I cannot explain, yet](#python_oddity)\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)"
      ]
@@ -188,8 +188,10 @@
      "source": [
       "<br>\n",
       "<br>\n",
-      "<a name='python_oddity'></a>\n",
-      "## Some Python Oddity that I cannot explain, yet"
+      "<a name='python_small_int'></a>\n",
+      "## Python reuses objects for small integers \n",
+      "\n",
+      "This oddity occurs, because Python tends to stores small integers as the same object, but not so for larger ones!"
      ]
     },
     {