diff --git a/userscript/AGENTS.md b/userscript/AGENTS.md
index 98fe033..fe495d3 100644
--- a/userscript/AGENTS.md
+++ b/userscript/AGENTS.md
@@ -78,6 +78,11 @@ Guidance for OpenCode (and Claude Code) working under `userscript/`. See root `A
   the clean title on a series page and `<Title> Chapter <n>` on a chapter page.
   Its series page lists every chapter with an
   absolute href, so the backend polls it with the plain TLS client.
+  The client performs no latest-chapter scan for this Site: the Poll's
+  one-hour cooldown dominates the client's four-hour throttle, so a scan
+  would add no freshness, and the page's wpdiscuz thread is a public write
+  surface a scan would have to truncate at. `computeLatestChapter` yields
+  null here and `backgroundRefreshLatest` skips the Site before any fetch.
 
 ### Second script: `novel-bookmark.user.js`