diff --git a/AGENTS.md b/AGENTS.md
index 47df64c..30bc268 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -12,6 +12,8 @@ Pagerite is a CMS. See `docs` for the full design and implementation details. Ke
 - `pagerite/` — Python backend package (hatchling build target).
   - `app.py` — FastAPI app and route registration.
   - `data.py` — msgspec Structs for the kanta database.
+  - `chunks.py` — block-level Markdown chunking and content-hash keys for the chunk stores (docs/migrate.md).
+  - `i18n.py` — language selection, translation assembly (chunks + patches).
   - `migrations.py` — kanta migrations (`migrate_vN`); ALL schema/storage upgrades live here (raw state dict before struct decoding), never in the app lifespan: v1 moves legacy in-db file blobs to the on-disk store and rebuilds the legacy flat `pages` as the menu tree, v2 rewrites `/_f/{hash}.ext` image links to the extension-less form, backfills AVIF/WebP/JPEG derivatives on disk and drops the obsolete `version` field.
   - `markdown.py` — markdown-it-py renderer.
   - `views.py` — shared page layout and rendering; theme/user-font resolution across `THEME_DIRS` / `FONT_DIRS` (cwd, site, platform data roots, then built-in `pagerite/themes/`, see `docs/themes-and-assets.md`).
diff --git a/docs/localization.md b/docs/localization.md
index 704336c..6da55c2 100644
--- a/docs/localization.md
+++ b/docs/localization.md
@@ -6,7 +6,7 @@ parameter or the `Accept-Language` header.
 - **Phase 1 (implemented):** negotiation, URL scheme, caching, rendering
   plumbing. Translations are consumed through a stub interface; the database
   still holds only the original language.
-- **Phase 2 (final plan):** gettext-style fragment storage in the
+- **Phase 2 (implemented):** gettext-style fragment storage in the
   database — machine-translated chunks plus user override patches, assembled
   at render time. Storage details in `docs/migrate.md`.
 
@@ -66,7 +66,7 @@ Region tags normalize to their base subtag (`fi-FI` → `fi`).
 - The markdown typographer (SmartyPants) is English-centric; per-language
   typographer options are a possible follow-up, not blocking.
 
-## Phase 2: fragment-based translation storage (draft)
+## Phase 2: fragment-based translation storage (implemented)
 
 Phase 1 assumed whole-page translated Markdown delivered from outside. The
 refined model is gettext-style: an article has **one primary version** (its
@@ -170,7 +170,7 @@ Full storage design and the `migrate_v3` restructuring live in
 - Article paths are stored and keyed **without leading slashes**
   (`"docs/setup"`, front page `""`); slashes are added only in hrefs.
 
-### Render pipeline (replaces the phase-1 `get_translation` stub)
+### Render pipeline (the phase-1 `get_translation` stub, now real)
 
 ```python
 def get_translation(path, lang, data) -> Translation | None:
diff --git a/docs/migrate.md b/docs/migrate.md
index 46d9493..1bf0380 100644
--- a/docs/migrate.md
+++ b/docs/migrate.md
@@ -1,6 +1,6 @@
 # migrate_v3: content-addressed chunk storage
 
-Status: **final plan**. `migrate_v3` restructures how article text and
+Status: **implemented**. `migrate_v3` restructures how article text and
 translations are stored, motivated by the localization model in
 `docs/localization.md` (phase 2). Since it is a full migration, it is free to
 break the current `Node.content: str | None` layout.
@@ -132,6 +132,21 @@ Chunking must be deterministic and shared with render/save, so
 `pagerite/chunks.py`) and are imported by both `migrations.py` and
 `views.py`/`app.py`.
 
+## Implementation notes (deviations from the plan above)
+
+- Chunking lives in `pagerite/chunks.py`; hashing uses the `blake3` package
+  (already a dependency) with a 16-byte digest (`hexdigest(16)`).
+- `Translation.titles` stayed keyed by node path (phase-1 shape, views
+  untouched): `get_translation` builds it by walking the menu with the same
+  per-title `trans[f"{chunk_key(node.title)}:{lang}"]` lookups.
+- Insert hunks anchor on the whole preceding block (not just its tail) —
+  a stronger, simpler search context.
+- `make_patch` diffs with `SequenceMatcher(autojunk=False)` so patches are
+  deterministic (popular lines like blank separators never become junk).
+- Step 3's path normalization is a no-op in practice: the only path-keyed
+  store (`patches`) starts empty at v3; analytics paths live outside the
+  kantadb. The code still strips leading slashes defensively.
+
 ## Garbage collection (later, manual or idle-time)
 
 Orphaned entries accumulate: chunks no longer referenced by any