diff --git a/htdocs/langs/en_US/products.lang b/htdocs/langs/en_US/products.lang
index a8ec90a47ab..a8942bd337f 100644
--- a/htdocs/langs/en_US/products.lang
+++ b/htdocs/langs/en_US/products.lang
@@ -404,7 +404,7 @@ PMPValueShort=WAP
 mandatoryperiod=Mandatory periods
 mandatoryPeriodNeedTobeSet=Note: Period (start and end date) must be defined
 mandatoryPeriodNeedTobeSetMsgValidate=A service requires a start and end period
-mandatoryHelper=Message to the user on the need to enter a start date and an end date on a service when creating / validating an invoice, commercial proposal, sales order. <br> This action is not blocking in the process of confirmation
+mandatoryHelper=Check this if you want a message to the user when creating / validating an invoice, commercial proposal, sales order without entering a start and end date on lines with this service.<br>Note that the message is a warning and not a blocking error.
 DefaultBOM=Default BOM
 DefaultBOMDesc=The default BOM recommended to use to manufacture this product. This field can be set only if nature of product is '%s'.
 Rank=Rank