diff --git a/README.md b/README.md
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 This project contains **pytudes**—Python programs for perfecting programming skills. 
 
-Some are in Jupyter (IPython) notebooks, some in `.py` files. You can view the files here (or if Github fails to load a notebook page, as it sometimes does, click the **NB** link to view on [nbviewer](http://nbviewer.jupyter.org/)); or clone the project, or run the notebooks online by clicking this button: [![Binder](https://mybinder.org/badge.svg)](https://mybinder.org/v2/gh/norvig/pytudes/master)
+Some are in Jupyter (IPython) notebooks, some in `.py` files. You can view the files here. or clone the project, or run the notebooks online by clicking this button: [![Binder](https://mybinder.org/badge.svg)](https://mybinder.org/v2/gh/norvig/pytudes/master) (Note: when Github serves are busy, you may get a "Something went wrong" error message when you try to view a notebook. If that happens, click the **NB** link to view the notebook on [nbviewer](http://nbviewer.jupyter.org/).)
  
 # Index of Jupyter (IPython) Notebooks