diff --git a/ipynb/Sierpinski.ipynb b/ipynb/Sierpinski.ipynb
index d076716..d70ac44 100644
--- a/ipynb/Sierpinski.ipynb
+++ b/ipynb/Sierpinski.ipynb
@@ -4,6 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
+    "<div align=\"right\">Peter Norvig</div\n",
     "# A Chaos Game with Triangles\n",
     "\n",
     "John D. Cook [proposed](https://www.johndcook.com/blog/2017/07/08/the-chaos-game-and-the-sierpinski-triangle/) an interesting \"game\" from the book *[Chaos and Fractals](https://smile.amazon.com/Chaos-Fractals-New-Frontiers-Science/dp/0387202293)*: start at a vertex of an equilateral triangle. Then move to a new point halfway between the current point and one of the three vertexes of the triangle, chosen at random. Repeat to create *N* points, and plot them. What do you get? \n",