diff --git a/htdocs/langs/en_US/commercial.lang b/htdocs/langs/en_US/commercial.lang
index 87cb8c6cd46..cd8269621e2 100644
--- a/htdocs/langs/en_US/commercial.lang
+++ b/htdocs/langs/en_US/commercial.lang
@@ -90,6 +90,7 @@ ThisIsInformationOnDocumentToSignFichinter=This is information on intervention t
 ThisIsInformationOnDocumentToSignSociete_rib=This is information on SEPA Mandate to sign
 ThisIsInformationOnDocumentToSignExpedition= This is information on shipment to sign
 SignatureProposalRef=Signature of quote/commercial proposal %s
+SignatureOrderRef=Signature of sale order %s
 SignatureContractRef=Signature of contract %s
 SignatureFichinterRef=Signature of intervention %s
 SignatureSociete_ribRef=Signature of SEPA Mandate %s