diff --git a/htdocs/langs/en_US/propal.lang b/htdocs/langs/en_US/propal.lang
index f3b5c1c5229..9b96a218392 100644
--- a/htdocs/langs/en_US/propal.lang
+++ b/htdocs/langs/en_US/propal.lang
@@ -84,3 +84,6 @@ ProposalLine=Proposal line
 # Document models
 DocModelAzurDescription=A complete proposal model (logo...)
 DocModelJauneDescription=Jaune proposal model
+
+# NumRef Modules
+MarbreNumRefModelDesc=Return numero with format %syymm-nnnn for proposals where yy is year, mm is month and nnnn is a sequence with no break and no return to 0