diff --git a/product/ERP5Type/DateUtils.py b/product/ERP5Type/DateUtils.py
index 0e152619ef8d82560b062232ef1a1d1cd68c01dc..569e886396c2f6ea01c8e4cf0397f4a946dda8be 100644
--- a/product/ERP5Type/DateUtils.py
+++ b/product/ERP5Type/DateUtils.py
@@ -499,7 +499,7 @@ def getNumberOfDayInMonth(date):
 def atTheEndOfPeriod(date, period):
   """
   return the last time value for a given date
-  and a given period
+  inside a given period
   year, month, week, day
   note that a week is ended at Sunday
   exemple: