diff --git a/src/lang/japanese.txt b/src/lang/japanese.txt
--- a/src/lang/japanese.txt
+++ b/src/lang/japanese.txt
@@ -4042,6 +4042,8 @@ STR_ERROR_CAN_T_DELETE_SIGN                                     :{WHITE}標示を削除できません
 # Translatable comment for OpenTTD's desktop shortcut
 STR_DESKTOP_SHORTCUT_COMMENT                                    :Transport Tycoon Deluxeを基にしたシミュレーションゲーム
 
+# Translatable descriptions in media/baseset/*.ob* files
+
 ##id 0x2000
 # Town building names
 STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1                      :超高層ビル