diff --git a/README.md b/README.md
index 643dda4..3422fa2 100644
--- a/README.md
+++ b/README.md
@@ -136,6 +136,13 @@ still work verbatim? Next live recon on ohm answers this.
 LAN gives "No route to host" for `ohm.fritz.box` (192.168.88.168). Ask
 Markus to wake / reach out when ready.
 
+### Acceptance criterion
+
+**1080p @ 30 fps, no dropped frames.** Applies to every device and every
+codec we claim support for. Same bar everywhere — don't grade RK3566 on a
+curve vs RK3588. Dropped-frame count comes from `mpv --msg-level=all=info`
+or `ffmpeg -f null -`; "no dropped frames" means zero across a 60 s clip.
+
 ## After ohm
 
 - **ampere** (RK3588) — once RockHard kernel tracks a tree with VDPU381