diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 370b10da626..f26b18152b9 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -6944,7 +6944,7 @@ function getCommonSubstitutionArray($outputlangs, $onlykey = 0, $exclude = null,
 			$substitutionarray['__SECUREKEYPAYMENT_MEMBER__'] = 'Security key for payment on a member subscription (one key per member)';
 			$substitutionarray['__SECUREKEYPAYMENT_ORDER__'] = 'Security key for payment on an order';
 			$substitutionarray['__SECUREKEYPAYMENT_INVOICE__'] = 'Security key for payment on an invoice';
-			$substitutionarray['__SECUREKEYPAYMENT_CONTRACTLINE__'] = 'Security key for payment on a a service';
+			$substitutionarray['__SECUREKEYPAYMENT_CONTRACTLINE__'] = 'Security key for payment on a service of a contract';
 
 			$substitutionarray['__DIRECTDOWNLOAD_URL_PROPOSAL__'] = 'Direct download url of a proposal';
 			$substitutionarray['__DIRECTDOWNLOAD_URL_ORDER__'] = 'Direct download url of an order';