diff --git a/Lib/_pydatetime.py b/Lib/_pydatetime.py
index 34ccb2da13d0f3..e001bd3bbba4b7 100644
--- a/Lib/_pydatetime.py
+++ b/Lib/_pydatetime.py
@@ -2306,7 +2306,6 @@ def __reduce__(self):
 
 def _isoweek1monday(year):
     # Helper to calculate the day number of the Monday starting week 1
-    # XXX This could be done more efficiently
     THURSDAY = 3
     firstday = _ymd2ord(year, 1, 1)
     firstweekday = (firstday + 6) % 7  # See weekday() above