diff --git a/supervised_class2/rf_regression.py b/supervised_class2/rf_regression.py
index 06ee72fb..ae31cef4 100644
--- a/supervised_class2/rf_regression.py
+++ b/supervised_class2/rf_regression.py
@@ -1,6 +1,7 @@
 # https://deeplearningcourses.com/c/machine-learning-in-python-random-forest-adaboost
 # https://www.udemy.com/machine-learning-in-python-random-forest-adaboost
 # uses house dataset from https://archive.ics.uci.edu/ml/machine-learning-databases/housing/
+# Alternate data source: https://archive.org/download/housing_202405/housing.data
 # put all files in the folder ../large_files
 from __future__ import print_function, division
 from future.utils import iteritems