diff --git a/htdocs/langs/en_US/main.lang b/htdocs/langs/en_US/main.lang
index e53f0df5585..5fad3a3fd20 100644
--- a/htdocs/langs/en_US/main.lang
+++ b/htdocs/langs/en_US/main.lang
@@ -291,10 +291,10 @@ DefaultGlobalValue=Global value
 Price=Price
 UnitPrice=Unit price
 UnitPriceHT=Unit price (net)
-UnitPriceTTC=Unit price
+UnitPriceTTC=Unit price (inc. tac)
 PriceU=U.P.
 PriceUHT=U.P. (net)
-PriceUTTC=U.P.
+PriceUTTC=U.P. (inc. tax)
 Amount=Amount
 AmountInvoice=Invoice amount
 AmountPayment=Payment amount