diff --git a/phpBB/language/en/install.php b/phpBB/language/en/install.php
index 1c27e2f40d..8515739dc9 100644
--- a/phpBB/language/en/install.php
+++ b/phpBB/language/en/install.php
@@ -128,7 +128,7 @@ $lang = array_merge($lang, array(
 	'DB_ERR_QUERY_FIRST_TABLE'	=> 'Error while executing <var>query_first</var>, %s (“%s”).',
 	'DB_ERR_SELECT'				=> 'Error while running <code>SELECT</code> query.',
 	'DB_HOST'					=> 'Database server hostname or DSN',
-	'DB_HOST_EXPLAIN'			=> 'DSN stands for Data Source Name and is relevant only for ODBC installs.',
+	'DB_HOST_EXPLAIN'			=> 'DSN stands for Data Source Name and is relevant only for ODBC installs. On PostgreSQL, use localhost to connect to the local server via UNIX domain socket and 127.0.0.1 to connect via TCP.',
 	'DB_NAME'					=> 'Database name',
 	'DB_PASSWORD'				=> 'Database password',
 	'DB_PORT'					=> 'Database server port',