diff --git a/library/language/ja/main.php b/library/language/ja/main.php
index 9413dbd2f..7936bb722 100644
--- a/library/language/ja/main.php
+++ b/library/language/ja/main.php
@@ -1846,7 +1846,7 @@ $lang['BOLD'] = '大胆な文:[b]text[/b](Ctrl+B)';
 $lang['ITALIC'] = 'テキストを斜体:[i]text[/i](Ctrl+I)';
 $lang['UNDERLINE'] = '下線文:[u]text[/u](Ctrl+U)';
 $lang['STRIKEOUT'] = 'Strikeout文:[s]text[/s](Ctrl+S)';
-$lang['BOX_TAG'] = 'Frame around text: [box]text[/box]';
+$lang['BOX_TAG'] = 'Frame around text: [box]text[/box] or [box=#333,#888]text[/box]';
 $lang['INDENT_TAG'] = 'Insert indent: [indent]text[/indent]';
 $lang['SUPERSCRIPT'] = 'Superscript text: [sup]text[/sup]';
 $lang['SUBSCRIPT'] = 'Subscript text: [sub]text[/sub]';