diff --git a/htdocs/langs/en_US/bills.lang b/htdocs/langs/en_US/bills.lang
index e5df33ec55f..5a12a3a7262 100644
--- a/htdocs/langs/en_US/bills.lang
+++ b/htdocs/langs/en_US/bills.lang
@@ -409,5 +409,5 @@ PDFCrabeDescription=Invoice PDF template Crabe. A complete invoice template (Tem
 # oursin PDF Model
 PDFOursinDescription=Invoice PDF template Oursin. A complete invoice template (Template alternative)
 # NumRef Modules
-TerreNumRefModelDesc1=Return numero with format %syymm-nnnn for standard invoices and %syymm-nnnn for credit notes where yy is year, mm is month and nnnn is a sequence with no break and no return to 0
+TerreNumRefModelDesc1=Return number with format %syymm-nnnn for standard invoices and %syymm-nnnn for credit notes where yy is year, mm is month and nnnn is a sequence with no break and no return to 0
 TerreNumRefModelError=A bill starting with $syymm already exists and is not compatible with this model of sequence. Remove it or rename it to activate this module.