diff --git a/docs/gotchas.md b/docs/gotchas.md
index abda3540..9c781519 100644
--- a/docs/gotchas.md
+++ b/docs/gotchas.md
@@ -145,7 +145,8 @@ files in subdirectories) fails with `EPERM`. Fix: pass
 The naive nginx pattern for a path-prefix SPA (`try_files $uri $uri/
 /matrix/index.html`) silently swallows asset 404s — a missing JS file
 returns `index.html` with a 200, so the JS runtime never loads and the
-page renders blank with no visible error (#685, fixed #684, narrowed #686).
+page renders blank with no visible error (#685; fixed in PR #684;
+#686 filed the follow-up edge-case, addressed in PR #729).
 Extension allowlists (tried in #686 → PR #729) have the same maintenance
 problem: any new file extension the SPA ships breaks silently.