diff --git a/htdocs/langs/en_US/mails.lang b/htdocs/langs/en_US/mails.lang
index eb0a1ec74a7..f34a2fb4a06 100644
--- a/htdocs/langs/en_US/mails.lang
+++ b/htdocs/langs/en_US/mails.lang
@@ -129,7 +129,7 @@ NbOfEMailingsSend=Mass emails sent
 IdRecord=ID record
 DeliveryReceipt=Delivery Ack.
 YouCanUseCommaSeparatorForSeveralRecipients=You can use the <b>comma</b> separator to specify several recipients.
-TagCheckMail=Track mail opening
+TagCheckMail=Invisible link to track mail opening
 TagUnsubscribe=Unsubscribe link
 TagSignature=Signature of sending user
 EMailRecipient=Recipient Email