small enrichment to readme

README.md

@@ -143,3 +143,9 @@ If the button is disabled, continue using the tool normally. The administrator m
 - If you refresh the page, you may need to upload the files again.
 - Do not share the tool password outside the approved user group.
 - Do not upload files unless they are intended to be processed by this tool.
+
+## If The Cleaning Fails
+
+If the cleaning process fails during AI matching, it may be caused by external API issues such as daily rate limits being exhausted, a selected AI model becoming unavailable, or a model being deprecated.
+
+If this happens, check the details in the technical documentation.