diff --git a/01.py b/day01.py
similarity index 95%
rename from 01.py
rename to day01.py
index 2f8bf80..a0f9048 100644
--- a/01.py
+++ b/day01.py
@@ -22,7 +22,7 @@ def loop_until_duplicate(numbers):
 
 def main():
     numbers = []
-    with open('01.txt') as f:
+    with open('day01.txt') as f:
         for line in f:
             numbers.append(int(line))
 
diff --git a/01.txt b/day01.txt
similarity index 100%
rename from 01.txt
rename to day01.txt