diff --git a/htdocs/langs/en_US/companies.lang b/htdocs/langs/en_US/companies.lang
index 060f153c6cd..c466d0acf9b 100644
--- a/htdocs/langs/en_US/companies.lang
+++ b/htdocs/langs/en_US/companies.lang
@@ -1,5 +1,7 @@
 # Dolibarr language file - en_US - soc
 ErrorBadEMail=EMail %s is wrong
+ErrorCompanyNameAlreadyExists=Company name %s already exists. Choose another one.
+ErrorPrefixAlreadyExists=Prefix %s already exists. Choose another one.
 MenuNewCompany=New company
 MenuNewCustomer=New customer
 MenuNewProspect=New prospect
diff --git a/htdocs/langs/fr_FR/companies.lang b/htdocs/langs/fr_FR/companies.lang
index 1eb720b3bd6..752b9bbec02 100644
--- a/htdocs/langs/fr_FR/companies.lang
+++ b/htdocs/langs/fr_FR/companies.lang
@@ -1,5 +1,7 @@
 # Dolibarr language file - fr_FR - soc
 ErrorBadEMail=EMail %s invalide
+ErrorCompanyNameAlreadyExists=Le nom de société %s existe déjà. Choisissez-en une autre.
+ErrorPrefixAlreadyExists=Le prefix %s existe déjà. Choisissez-en un autre.
 MenuNewCompany=Nouvelle société
 MenuNewCustomer=Nouveau client
 MenuNewProspect=Nouveau prospect