diff --git a/docs/impl/reports/Z27AG-DECODE-1.md b/docs/impl/reports/Z27AG-DECODE-1.md
index a362a72..f6e993f 100644
--- a/docs/impl/reports/Z27AG-DECODE-1.md
+++ b/docs/impl/reports/Z27AG-DECODE-1.md
@@ -47,9 +47,16 @@ jack-stands session and a GNSS-matched drive settle both the byte order and the
 ## Not on this bus (or not seen)
 
 - **Clutch pedal:** nothing changed in 3 presses, engine off.
-- **Gear position:** nothing in 5 gears, reverse or neutral. Expected for a manual. The
-  gear can be computed from rpm ÷ wheel speed once the scale is known.
-- **Reverse:** no reverse bit found. The reverse lamp is probably wired directly.
+- **Gear position:** nothing in 5 gears, reverse or neutral. Expected for a manual:
+  nothing on the car consumes it. Not computed from rpm ÷ wheel speed either (owner's
+  call, 2026-10-13): the clutch is invisible, so the ratio lies whenever it slips or is
+  down, and the gear matters most at a standstill (no 3rd-gear launch), where the ratio
+  says nothing. A *recommended* gear from speed and rpm is the useful form, if any.
+- **Reverse:** rechecked against both reverse stretches (engine-off gear walk, engine-on
+  back crawl) versus every other gear, neutral, the forward crawl and idle: no bit
+  separates them (the one near-miss, `449.0.0`, is the low bit of a temperature). The
+  reverse lamp is wired, not on this bus; a backup camera would take its trigger from
+  the lamp circuit. The jack-stands run's reverse step is one more sample.
 - **Steering angle:** not analysed yet (step 5 was done with the engine on, at the end).
 
 ## Not analysed yet