diff --git a/htdocs/langs/en_US/expensereports.lang b/htdocs/langs/en_US/expensereports.lang
index 624a278b393..6a305e43ad7 100644
--- a/htdocs/langs/en_US/expensereports.lang
+++ b/htdocs/langs/en_US/expensereports.lang
@@ -1 +1,9 @@
 ExpenseReportPayments=Expense report payments
+#
+# error
+#
+
+TaxUndefinedForThisCategory = Taxe undefined for this category
+ErrorRecordNotFound=Record not found
+errorComputeTtcOnMileageExpense=Error on computing mileage expense
+ErrorBadValueForParameter=Error bad value for parameter %s