diff --git a/docs/map.md b/docs/map.md
index d970719..461dec9 100644
--- a/docs/map.md
+++ b/docs/map.md
@@ -14,6 +14,7 @@ A fast, single-user, locally hosted web app (`app.py` + vanilla HTML/CSS/JS in `
 
 <!-- the index: one line per closed ticket, enough to judge relevance, then zoom the link for the detail the ticket holds -->
 - [Decouple core photo cleaning logic for CLI and API reuse](https://code.tilltheend.de/tilltheend/unwrap-clothes/issues/2): Extracted encoding, OpenRouter API client, and in-memory Lanczos resolution restoration into `cleaner.py`, supporting both raw bytes and paths for CLI and web API reuse.
+- [Implement FastAPI backend and /api/clean endpoint in app.py](https://code.tilltheend.de/tilltheend/unwrap-clothes/issues/3): Built FastAPI service in `app.py` exposing `POST /api/clean` with multipart upload, base64 data URI response, Lanczos toggle, and static file hosting.
 
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