diff --git a/Appendix-A-Installation.ipynb b/Appendix-A-Installation.ipynb
index 5f7076d..3b6d329 100644
--- a/Appendix-A-Installation.ipynb
+++ b/Appendix-A-Installation.ipynb
@@ -786,6 +786,53 @@
     "\n",
     "sympy.integrate(F_k*Q*F_k.T,(dt, 0, dt))"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "** orphan text from the preface**\n",
+    "\n",
+    "\n",
+    "** author's note**. *The book is still being written, and so I am not focusing on issues like supporting multiple versions of Python. I am staying more or less on the bleeding edge of Python 3 for the time being. If you follow my suggestion of installing Anaconda all of the versioning problems will be taken care of for you, and you will not alter or affect any existing installation of Python on your machine. I am aware that telling somebody to install a specific packaging system is not a long term solution, but I can either focus on endless regression testing for every minor code change, or work on delivering the book, and then doing one sweep through it to maximize compatibility. I opt for the latter. In the meantime I welcome bug reports if the book does not work on your platform.*\n",
+    "\n",
+    "If you want to run the notebook on your computer, which is what I recommend, then you will have to have IPython 2.4 or later installed. IPython is an interactive architecture that provides IPython Notebook, the tool used to write this book. Note that the IPython version has nothing to do with the Python version. IPython 2.4 can run Python 3.4, IPython 3.0 can run Python 2.7, and so on. \n",
+    "\n",
+    "I do not cover how to install IPython in this book; requirements change based on what other python installations you may have, whether you use a third party package like Anaconda Python, what operating system you are using, and so on.\n",
+    "\n",
+    "The IPython Notebook format was changed as of IPython 3.0. If you are running 2.4 you will still be able to open and run the notebooks, but they will be down converted for you. If you make changes DO NOT push 2.4 version notebooks to me! I strongly recommend updating to 3.0 as soon as possible, as this format change will just become more frustrating with time.\n",
+    "\n",
+    "You will need Python 2.7 or later installed. Almost all of my work is done in Python 3.4, but I periodically test on 2.7. I do not promise any specific check in will work in 2.7 however. I do use Python's \"from __future__ import ...\" statement to help with compatibility. For example, all prints need to use parenthesis. If you try to add, say, \"print 3.14\" into the book your script will fail; you must write \"print (3.4)\" as in Python 3.X.\n",
+    "\n",
+    "You will need a recent version of NumPy, SciPy, SymPy, and Matplotlib installed. I don't really know what the minimal version might be. I have NumPy 1.71, SciPy 0.13.0, and Matplotlib 1.4.0 installed on my machines.\n",
+    "\n",
+    "Personally, I use the Anaconda Python distribution in all of my work, [available here](https://store.continuum.io/cshop/anaconda/) [3]. I am not selecting them out of favoritism, I am merely documenting my environment. Should you have trouble running any of the code, perhaps knowing this will help you.\n",
+    "\n",
+    "Finally, you will need to install FilterPy, described in the next section.\n",
+    "\n",
+    "Installation of all of these packages is described in the Installation appendix, which you can read online [here](http://nbviewer.ipython.org/github/rlabbe/Kalman-and-Bayesian-Filters-in-Python/blob/master/Appendix_A_Installation.ipynb).\n",
+    "\n",
+    "http://nbviewer.ipython.org/github/rlabbe/Kalman-and-Bayesian-Filters-in-Python/blob/master/Appendix_A_Installation.ipynb\n",
+    "\n",
+    "\n",
+    "I am writing an open source Bayesian filtering Python library called FilterPy. I have made the project available on PyPi, the Python Package Index. To install from PyPi, at the command line issue the command\n",
+    "\n",
+    "pip install filterpy\n",
+    "If you do not have pip, you may follow the instructions here: https://pip.pypa.io/en/latest/installing.html.\n",
+    "\n",
+    "I recommend using pip for the install, as I try hard (sometimes I fail) to make good, safe releases to it. Whereas on github (where the project resides) I'll check in any tiny change at any time; there is no guarantee that the latest on github is a version you really want to have.\n",
+    "\n",
+    "FilterPy is hosted GitHub at (https://github.com/rlabbe/filterpy). If you want the bleading edge release you will want to grab a copy from GitHub, and follow your Python installation's instructions for adding it to the Python search path. However, it is quite possible that it will not be compatible with the notebooks in this project. I try to make sure the notebooks are in sync with the PyPi hosted version."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {