diff --git a/docs/superpowers/VERIFICATION.md b/docs/superpowers/VERIFICATION.md
index 69ad20f..fccc9ef 100644
--- a/docs/superpowers/VERIFICATION.md
+++ b/docs/superpowers/VERIFICATION.md
@@ -42,3 +42,19 @@ Add-AppxPackage -Path Packaging\TaskbarCalculator.msix
 - [ ] App installs and appears in Start; launches to the tray
 - [ ] Right-click → *Start at login* is enabled/checkable (not grayed)
 - [ ] Toggling it on shows the app under Settings → Apps → Startup
+
+## Auto-hide caption (2026-07-15)
+
+Verified interactively by the user on the fixed build (commit 735d272):
+
+- ✅ Caption + X visible only while the window is active; chromeless when inactive.
+- ✅ Display never moves when the frame toggles (client rect pinned).
+- ✅ Position persists across restarts with no vertical drift (canonical client origin).
+- ✅ X hides to tray; drag by caption and by body both work.
+- ✅ Keyboard entry still wired: `12+34` Enter → `46`.
+- ✅ Two-monitor case: calculator on a secondary monitor, repeated focus toggles — no
+  jumping (per-monitor work-area clamp).
+- ✅ Engine regression: 16/16 (`tests\build-and-run.cmd`).
+
+Known accepted behavior (see spec): caption disappears while the tray menu / About
+dialog is open; a foreground-denied show leaves the window chromeless until clicked.
diff --git a/docs/superpowers/specs/2026-07-15-auto-hide-caption-design.md b/docs/superpowers/specs/2026-07-15-auto-hide-caption-design.md
index 2a2a95b..416ddbb 100644
--- a/docs/superpowers/specs/2026-07-15-auto-hide-caption-design.md
+++ b/docs/superpowers/specs/2026-07-15-auto-hide-caption-design.md
@@ -30,7 +30,8 @@ caption grows upward when it appears and retracts when it disappears; the displa
 number never moves.
 
 - On toggle: take the current client rect in screen coordinates
-  (`GetClientRect` + `ClientToScreen`), compute the new window rect for the new style
+  (`GetClientRect` + `MapWindowPoints`, which stays correct under RTL mirroring),
+  compute the new window rect for the new style
   with `AdjustWindowRectEx`, and pass position + size to the same `SetWindowPos` call
   that applies `SWP_FRAMECHANGED`.
 - Safety clamp: if growing upward would push the window top above the work area top,