diff --git a/01_assignment/read_mnist.py b/01_assignment/read_mnist.py
index b135b28..f4ebfc1 100644
--- a/01_assignment/read_mnist.py
+++ b/01_assignment/read_mnist.py
@@ -1,3 +1,5 @@
+#  This code is a modified version of public code provided by http://abel.ee.ucla.edu/cvxopt/_downloads/mnist.py
+
 import os
 import sys
 import struct
diff --git a/03_assignment/demoClassification_updated.m b/03_assignment/demoClassification_updated.m
index 3fbad37..e1716c1 100644
--- a/03_assignment/demoClassification_updated.m
+++ b/03_assignment/demoClassification_updated.m
@@ -1,3 +1,5 @@
+%  This code is a modified version of public code provided by http://www.gaussianprocess.org/gpml/code/matlab/doc/
+
 disp('See http://www.gaussianprocess.org/gpml/code/matlab/doc/ for details.')
 disp('Hit any key to continue...'); pause