diff --git a/index.html b/index.html
index dfc73b9..b86bfb6 100644
--- a/index.html
+++ b/index.html
@@ -130,6 +130,11 @@ <h2>Notebooks and accompanying videos</h2>
 <a href="http://nbviewer.ipython.org/github/mbakker7/exploratory_computing_with_python/blob/master/notebook13_regression1/py_exploratory_comp_13_sol.ipynb">Notebook 13</a>
 </p>
 
+<p> 
+Test Notebooks 1-4 &mdash;
+<a href="http://nbviewer.ipython.org/github/mbakker7/exploratory_computing_with_python/blob/master/notebook1-4_test/notebook1-4_test.ipynb">Test Notebook 1-4</a>
+</p>
+
 <p> To be added soon: Regression II, ipywidgets, animations</p>