diff --git a/doc/src/Regression/Regression.do.txt b/doc/src/Regression/Regression.do.txt
index daa6a14e9..1cac2287d 100644
--- a/doc/src/Regression/Regression.do.txt
+++ b/doc/src/Regression/Regression.do.txt
@@ -789,6 +789,7 @@ years etc.
 We will discuss in more
 detail these and other functions in the various lectures.  We conclude this part with another example. Instead of 
 a linear $x$-dependence we study now a cubic polynomial and use the polynomial regression analysis tools of scikit-learn. 
+Add description of the various python commands.
 
 !bc pycod
 import matplotlib.pyplot as plt