diff --git a/src/tools/make_dates.py b/src/tools/make_dates.py
index 0272445..ffda335 100644
--- a/src/tools/make_dates.py
+++ b/src/tools/make_dates.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # coding: utf-8
-"""Make dates on second Tuesday of the month for full year"""
+"""Make dates on second Tuesday of the month for full year."""
 
 
 import datetime