diff --git a/sandbox/__init__.py b/sandbox/__init__.py
index 4562fd8..82442ac 100644
--- a/sandbox/__init__.py
+++ b/sandbox/__init__.py
@@ -1,13 +1,14 @@
 from datetime import datetime
 
 
 def useful_function():
+    "telling the truth might be useful"
     return 42
 
 
 def is_towel_day(day=None):
     """Return True if it's that day of the year you must not
     forget your towel."""
     if day is None:
         day = datetime.today()
     return (day.day, day.month) == (25, 5)