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diff --git a/src/CHANGELOG.md b/src/CHANGELOG.md
index 4fef47fc..66c9fb0c 100644
--- a/src/CHANGELOG.md
+++ b/src/CHANGELOG.md
@@ -26,6 +26,30 @@
   own in the process: the macOS build roots at `macos.zig`, so the one in
   `main.zig` had never run there — in the shell with the least useful stderr of
   the four.
+- A big screen can attach to a detached session. The wire's grid ceiling is
+  512x128 and no frontend ever clamped to it — the hello carried the window
+  raw — so a 4K display at a small font, which is already past 128 rows, had
+  its geometry refused by the session's decoder as `BadValue`. That path
+  answers with `close(.protocol)` and no `refuse` behind it, so the frontend
+  reported the one thing a bare hangup can mean: "that session hung up on the
+  connect", at a session with all 32 slots free. `client.zig` now asks for the
+  largest grid the protocol carries, which is what its own GEOMETRY note
+  already promises a frontend gets — the session is drawn at its own size in
+  the corner of a bigger window, exactly as when another frontend is the
+  smaller one. A zero geometry is dropped rather than clamped, because the
+  session grid is the smallest common one and a frontend reporting 1 would
+  collapse everybody else: `TIOCGWINSZ` answers 0x0 during a teardown and the
+  tty shell forwarded it, so that was the same mute hangup by another route.
+  The clamp alone would have replaced one bug with a worse one: `max_cols *
+  max_rows` is 65536 and a run's length prefix is a `u16`, so the single grid
+  legal at both bounds is the one grid whose full frame — and an attach always
+  produces a full frame — cannot be described by one run. It panicked on the
+  `@intCast` in a safe build and was illegal behaviour in a fast one. The
+  encoder splits the run instead, which `frameBound` had already paid for, and
+  the protocol version is bumped to 2: the geometry a v2 frontend now asks for
+  is one a v1 daemon panics encoding, so a mixed pair — `zig build` replacing
+  the binary under a running session — meets a `Refusal.version` instead of
+  losing every pane shell the daemon owns.
 - A filtered terminal costs what an unfiltered one does. `Filter`'s second
   stage asked `RGB.contrast` for every cell it painted, and that call ends in
   `std.math.pow` six times over — a libm round trip per cell, per frame, to