diff --git a/README.md b/README.md
index 0589ef1..e1331c2 100644
--- a/README.md
+++ b/README.md
@@ -1483,6 +1483,15 @@ Things I chose while building, with the reasoning:
     and the pixel-contrast scan lost a finding (the Aero study chip, 4.49:1). The suites also find
     Playwright's Chromium on macOS now (`~/Library/Caches/ms-playwright`).
 
+98. **The chat composer's textarea has no scrollbar.** With enough text the auto-growing field
+    capped at 180px revealed the browser scrollbar inside the frosted tile — over the Aero glass it
+    read as a broken widget, not an affordance ("that ugly scroll bar in the box where you put in
+    the prompts"). The field carries the shared `.no-scrollbar` style now: bar gone in all three
+    themes (verified against production: `scrollbar-width: none`, webkit `display: none`), while
+    `overflow` stays `auto`, so long messages still wheel-scroll and the caret line is scrolled
+    into view as you type. No strings, so no i18n; the additive change sits on top of the merged
+    scene-heat rework unchanged.
+
 97. **Nested tiles inside the real-blur chrome drop the baked backdrop.** "Frutiger aero theme —
     the attachment button looks completely different to the other ones." The composer band, the
     chat header and the study pager keep a real `backdrop-filter` (they float over scrolling