diff --git a/DESIGN/05-card-window.md b/DESIGN/05-card-window.md
index 38e98de..66702f2 100644
--- a/DESIGN/05-card-window.md
+++ b/DESIGN/05-card-window.md
@@ -98,7 +98,7 @@ Designed 2026-07-29 (storage: 01-storage-format.md ▸ Enhanced schema). Ships i
 
 ## Window
 
-- **The subtitle shows the card's place**: "⟨board⟩ › ⟨lane⟩" under the window title, live-updating as the card moves (the window follows its card).
+- **The subtitle shows the card's place**: "⟨board⟩ › ⟨lane⟩" under the window title, live-updating as the card moves (the window follows its card). **Hidden with the title, and the loss is blessed** (ruled 2026-08-06): the no-title titlebar (Toolbar below — `titleVisibility = .hidden`) collapses AppKit's title and subtitle as one field, so the pair hides together; the window is usually beside its board, and `window.title`/`window.subtitle` keep feeding the Window menu, Exposé, VoiceOver, and restoration, so only the visual rendering is lost. The computation and live-update wiring stand untouched — if a visible placement surface is ever wanted (a details-sidebar placement row is the named candidate), it is a surface away, not a rewiring; deliberately not built now.
 - New windows open at the last-used card-window size, cascaded; frames restore per card across relaunch where state restoration allows.
 - **Toolbar (settled — 03-board-ui.md ▸ Toolbar)**: default set Edit Body (single toggle, on-state in Edit) · Raw Source (toggle; while active, Edit Body disables) · Add Attachment; user-customizable like the board window's.