diff --git a/docs/RECOMMENDATIONS.md b/docs/RECOMMENDATIONS.md
index 330fc66..6f0823e 100644
--- a/docs/RECOMMENDATIONS.md
+++ b/docs/RECOMMENDATIONS.md
@@ -281,3 +281,54 @@ Items з статусом `DONE`, `WONTFIX`, `DEFERRED` переходять у
 
 *Last update: 2026-05-01 (W1-W3 workflow + D1-D4 doc items added).*
 *Initial backlog: 2026-04-30 (gocc1+2+3+4 audits).*
+
+## D-canonical-archive — Canonical points to `/v/` instead of archive URL pattern (13 sites)
+
+**Зона:** Backend (admin/dev) — потребує kor reboot.
+
+**Symptom:** На archive routes (`/v/arch/`, `/v-cache/`, `/v/stored/`, etc. per CSV new-url-pattern) canonical link генерується як `/v/<id>/...` (standard) замість archive URL. Robots `noindex,follow` правильно set, але canonical не reflects archive.
+
+**Root cause:** `views/id_index.etlua` line ~90 hardcodes `/v/` у canonical generation. Frontend не має access до runtime URL (`ngx.var.uri` not accessible у etlua context, `mysettings.cur_uri` not set).
+
+**Reference (8161 has partial setup):**
+- `var.archive_video_dir = "/v-arch/"`
+- `var.canonical_without_archive = 1` — explicit strip → canonical = standard `/v/` (BY DESIGN для 8161)
+- `app.lua` line 2408-2409 використовує `archive_video_dir` для URL formation
+
+**Fix per site (13 sites — крім 8161 яке by design strip):**
+
+```lua
+-- lib/<port>/var.lua
+var.archive_video_dir = "<new-pattern-per-CSV>"  -- e.g. "/v/arch/" для 8159
+var.canonical_without_archive = 0  -- canonical KEEPS archive prefix
+var.nofollow_on_archive = 1  -- if not already
+```
+
+Per CSV `new-url-pattern` column:
+| Port | new-url-pattern |
+|------|-----------------|
+| 8159 | /v/arch/ |
+| 8163 | /v-cache/ |
+| 8158 | /v/stored/ |
+| 8151 | /v/old/ |
+| 8160 | /v/storage/ |
+| 8153 | /v/archive/ |
+| 8154 | /v/unlisted/ |
+| 8155 | /v/shelved/ |
+| 8156 | /v/disabled/ |
+| 8157 | /v/bin/ |
+| 8162 | /v-storage/ |
+| 8150 | /video/old/ |
+| 8152 | /v/parked/ |
+
+Plus `subrouter.lua` route registration якщо missing — verify each site handles archive route.
+
+**Verify post-deploy:**
+```bash
+curl -sL "https://www.<domain>/<archive-pattern><id>/<slug>" | grep -oE 'rel="canonical" href="[^"]+"'
+# Expected: href="https://www.<domain>/<archive-pattern><id>/<slug>" (canonical=archive URL)
+```
+
+**Frontend template** (`id_index.etlua`) можливо потребує adjustment коли backend exposes `mysettings.cur_archive_path` чи similar — depending on app.lua implementation.
+
+Reported 2026-05-05 by user audit на 8159 → bug confirmed на ВСІХ 13 sites with archive routing setup.