diff --git a/administrator/components/com_patchtester/language/ja-JP/com_patchtester.ini b/administrator/components/com_patchtester/language/ja-JP/com_patchtester.ini
index f167a9d..d7043ad 100644
--- a/administrator/components/com_patchtester/language/ja-JP/com_patchtester.ini
+++ b/administrator/components/com_patchtester/language/ja-JP/com_patchtester.ini
@@ -4,6 +4,7 @@
 ; Note : All ini files need to be saved as UTF-8
 
 COM_PATCHTESTER="Joomla!パッチテスタ"
+COM_PATCHTESTER_40_WARNING="While Joomla! 4.0 is in development, using the patch tester is considered experimental since breaking changes may be merged into Joomla, including the code contained in a patch."
 COM_PATCHTESTER_API_LIMIT_ACTION="The GitHub API rate limit has been reached for this resource, could not connect to GitHub to perform the requested action. The rate limit will reset at %s"
 COM_PATCHTESTER_API_LIMIT_LIST="The GitHub API rate limit has been reached for this resource, could not connect to GitHub for updated data. The rate limit will reset at %s"
 COM_PATCHTESTER_APPLIED="適用"