diff --git a/code/ch01/tests/test_notebooks.py b/code/ch01/tests/test_notebooks.py
index b1f6f6cb..0fb3d444 100644
--- a/code/ch01/tests/test_notebooks.py
+++ b/code/ch01/tests/test_notebooks.py
@@ -1,3 +1,4 @@
+#importing the reqired libraries
 import unittest
 import os
 import subprocess