diff --git a/website/WIKI_UPGRADE.md b/website/WIKI_UPGRADE.md
index 3a95ffe..e66e0a4 100644
--- a/website/WIKI_UPGRADE.md
+++ b/website/WIKI_UPGRADE.md
@@ -309,10 +309,17 @@ phase if preferred). Do not merge a phase that hasn't been verified.
   `<script>` stripped); a toolbar edit (insert divider) saved and persisted. TipTap
   is code-split into its own chunk (lazy-loaded), keeping it off the public bundle.
 
-### Phase 3 — Connectivity
+### Phase 3 — Connectivity ✅
 - Internal `[[slug]]` links + red-link detection; `wiki_links` rebuild on save;
   backlinks on the article; tags + tag/category filtering.
 - **Exit check**: link page A→B, confirm B shows A under "Linked from"; tag filter works.
+- **Verified** (2026-06-27): internal links authored via an in-editor page picker
+  (links to `/wiki/<slug>`); A→B made B list A under "Linked from"; a link to a
+  non-existent page renders as a red link; removing the link on save cleared the
+  backlink (link index rebuilt). Tags upsert on save, filter via `?tag=` (chips +
+  flat index view), list with published counts, and orphan tags are auto-pruned.
+- Implementation note: links are plain anchors to `/wiki/<slug>` (the WYSIWYG fits
+  this better than `[[ ]]` syntax); the sanitizer also allows `data-wiki-slug`.
 
 ### Phase 4 — Discovery & trust
 - FULLTEXT search (public search box + admin filter); revision history list /