diff --git a/htdocs/langs/en_US/install.lang b/htdocs/langs/en_US/install.lang
index f9d1d1338c69c41e14299166cf7efa8ec597ec99..e417479758dd2e879510c5e640e6f0298ccb6c96 100644
--- a/htdocs/langs/en_US/install.lang
+++ b/htdocs/langs/en_US/install.lang
@@ -132,6 +132,10 @@ ActivateModule=Activate module %s
 ShowEditTechnicalParameters=Click here to show/edit advanced parameters (expert mode)
 WarningUpgrade=Warning:\nDid your run a database backup first ?\nThis is highly recommanded: for example, due to some bugs into databases systems (for example mysql version 5.5.40/41/42/43), some data or tables may be lost during this process, so it is highly recommanded to have a complete dump of your database before starting migration.\n\nClick OK to start migration process...
 ErrorDatabaseVersionForbiddenForMigration=Your database version is %s. It has a critical bug making data loss if you make structure change on your database, like it is required by the migration process. For his reason, migration will not be allowed until you upgrade your database to a higher fixed version (list of known bugged version: %s) 
+KeepDefaultValuesWamp=You use the Dolibarr setup wizard from DoliWamp, so values proposed here are already optimized. Change them only if you know what you do.
+KeepDefaultValuesDeb=You use the Dolibarr setup wizard from a Linux package (Ubuntu, Debian, Fedora...), so values proposed here are already optimized. Only the password of the database owner to create must be completed. Change other parameters only if you know what you do.
+KeepDefaultValuesMamp=You use the Dolibarr setup wizard from DoliMamp, so values proposed here are already optimized. Change them only if you know what you do.
+KeepDefaultValuesProxmox=You use the Dolibarr setup wizard from a Proxmox virtual appliance, so values proposed here are already optimized. Change them only if you know what you do.
 
 #########
 # upgrade