diff --git a/htdocs/langs/en_US/admin.lang b/htdocs/langs/en_US/admin.lang
index 4478b3fb146..3659bc8a2cb 100644
--- a/htdocs/langs/en_US/admin.lang
+++ b/htdocs/langs/en_US/admin.lang
@@ -2144,7 +2144,9 @@ EmailTemplate=Template for email
 EMailsWillHaveMessageID=Emails will have a tag 'References' matching this syntax
 PDF_SHOW_PROJECT=Show project on document
 ShowProjectLabel=Project Label
-PDF_THIRDPARTY_NAME_TO_SHOW_IS = Include alias in thirdparty name
+PDF_THIRDPARTY_NAME_TO_SHOW_IS=Include alias in thirdparty name
+THIRDPARTY_ALIAS=Name thirdparty - Alias thirdparty 
+ALIAS_THIRDPARTY=Alias thirdparty - Name thirdparty
 PDF_USE_ALSO_LANGUAGE_CODE=If you want to have some texts in your PDF duplicated in 2 different languages in the same generated PDF, you must set here this second language so generated PDF will contains 2 different languages in same page, the one chosen when generating PDF and this one (only few PDF templates support this). Keep empty for 1 language per PDF.
 PDF_USE_A=Gererate PDF documents with format PDF/A instead of defaut format PDF
 FafaIconSocialNetworksDesc=Enter here the code of a FontAwesome icon. If you don't know what is FontAwesome, you can use the generic value fa-address-book.