diff --git a/README.md b/README.md
index 2df42932..43fa9b8d 100644
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+++ b/README.md
@@ -70,7 +70,7 @@ binder serves interactive notebooks online, so you can run the code and change t
 
 ### nbviewer
 
-The website http://nbviewer.org provides a Jupyter Notebook server that renders notebooks stored at github (or elsewhere). The rendering is done in real time when you load the book. You may use [*this nbviewer link*](http://nbviewer.ipython.org/github/rlabbe/Kalman-and-Bayesian-Filters-in-Python/blob/master/table_of_contents.ipynb) to access my book via nbviewer. If you read my book today, and then I make a change tomorrow, when you go back tomorrow you will see that change. Notebooks are rendered statically - you can read them, but not modify or run the code.
+The website http://nbviewer.org provides a Jupyter Notebook server that renders notebooks stored at github (or elsewhere). The rendering is done in real time when you load the book. You may use [*this nbviewer link*](http://nbviewer.org/github/rlabbe/Kalman-and-Bayesian-Filters-in-Python/blob/master/table_of_contents.ipynb) to access my book via nbviewer. If you read my book today, and then I make a change tomorrow, when you go back tomorrow you will see that change. Notebooks are rendered statically - you can read them, but not modify or run the code.
 
 nbviewer seems to lag the checked in version by a few days, so you might not be reading the most recent content.