diff --git a/htdocs/install/inc.php b/htdocs/install/inc.php
index b999eefe6a464154bfd4cb5b238fdde365942b70..1a83665d99cdb2082b4b21b3001be19327841f91 100644
--- a/htdocs/install/inc.php
+++ b/htdocs/install/inc.php
@@ -302,9 +302,9 @@ function conf($dolibarr_main_document_root)
 
     if (empty($character_set_client)) $character_set_client="UTF-8";
     $conf->file->character_set_client=strtoupper($character_set_client);
-    if (empty($dolibarr_main_db_character_set)) $dolibarr_main_db_character_set=($conf->db->type=='mysql'?'latin1':'');		// Old installation
+    if (empty($dolibarr_main_db_character_set)) $dolibarr_main_db_character_set=($conf->db->type=='mysql'?'latin1':'');		// With old installation, var is not defined. New one, constant should be set to utf8
     $conf->db->character_set=$dolibarr_main_db_character_set;
-    if (empty($dolibarr_main_db_collation)) $dolibarr_main_db_collation=($conf->db->type=='mysql'?'latin1_swedish_ci':'');  // Old installation
+    if (empty($dolibarr_main_db_collation)) $dolibarr_main_db_collation=($conf->db->type=='mysql'?'latin1_swedish_ci':'');  // With old installation, var is not defined. New one, constant should be set to utf8_general_ci
     $conf->db->dolibarr_main_db_collation=$dolibarr_main_db_collation;
     if (empty($dolibarr_main_db_encryption)) $dolibarr_main_db_encryption=0;
     $conf->db->dolibarr_main_db_encryption = $dolibarr_main_db_encryption;