diff --git a/phpBB/includes/acp/acp_board.php b/phpBB/includes/acp/acp_board.php
index 7680d8996c..927e72010e 100644
--- a/phpBB/includes/acp/acp_board.php
+++ b/phpBB/includes/acp/acp_board.php
@@ -58,7 +58,7 @@ class acp_board
 						'board_disable_msg'		=> false,
 						'default_lang'			=> array('lang' => 'DEFAULT_LANGUAGE',		'validate' => 'lang',	'type' => 'select', 'function' => 'language_select', 'params' => array('{CONFIG_VALUE}'), 'explain' => false),
 						'default_dateformat'	=> array('lang' => 'DEFAULT_DATE_FORMAT',	'validate' => 'string',	'type' => 'custom', 'method' => 'dateformat_select', 'explain' => true),
-						'board_timezone'		=> array('lang' => 'SYSTEM_TIMEZONE',		'validate' => 'string',	'type' => 'select', 'function' => 'tz_select', 'params' => array('{CONFIG_VALUE}', 1), 'explain' => false),
+						'board_timezone'		=> array('lang' => 'SYSTEM_TIMEZONE',		'validate' => 'string',	'type' => 'select', 'function' => 'tz_select', 'params' => array('{CONFIG_VALUE}', 1), 'explain' => true),
 						'board_dst'				=> array('lang' => 'SYSTEM_DST',			'validate' => 'bool',	'type' => 'radio:yes_no', 'explain' => false),
 						'default_style'			=> array('lang' => 'DEFAULT_STYLE',			'validate' => 'int',	'type' => 'select', 'function' => 'style_select', 'params' => array('{CONFIG_VALUE}', false), 'explain' => false),
 						'override_user_style'	=> array('lang' => 'OVERRIDE_STYLE',		'validate' => 'bool',	'type' => 'radio:yes_no', 'explain' => true),
diff --git a/phpBB/language/en/acp/board.php b/phpBB/language/en/acp/board.php
index 52389d85b9..80db81653d 100644
--- a/phpBB/language/en/acp/board.php
+++ b/phpBB/language/en/acp/board.php
@@ -50,7 +50,8 @@ $lang = array_merge($lang, array(
 	'SITE_DESC'						=> 'Site description',
 	'SITE_NAME'						=> 'Site name',
 	'SYSTEM_DST'					=> 'Enable Summer Time/<abbr title="Daylight Saving Time">DST</abbr>',
-	'SYSTEM_TIMEZONE'				=> 'System timezone',
+	'SYSTEM_TIMEZONE'				=> 'Guest timezone',
+	'SYSTEM_TIMEZONE_EXPLAIN'			=> 'Timezone to use for displaying times to users who are not logged in (guests, bots). Logged in users set their timezone during registration and can change it in user control panel.',
 	'WARNINGS_EXPIRE'				=> 'Warning duration',
 	'WARNINGS_EXPIRE_EXPLAIN'		=> 'Number of days that will elapse before the warning will automatically expire from a user’s record.',
 ));