diff --git a/exercises_loop.py b/exercises_loop.py
index ba198b9..dc6b288 100644
--- a/exercises_loop.py
+++ b/exercises_loop.py
@@ -1,3 +1,4 @@
+# These exercises correspond to the tutorial on https://www.anaisberck.be/python-loops/
 ### Exercise 1. Print a list of words of the song
 # + next to each word its position in the sentence