diff --git a/local/docs/USB-IMPLEMENTATION-PLAN.md b/local/docs/USB-IMPLEMENTATION-PLAN.md
index 58cbc7a1fe..12d372cff3 100644
--- a/local/docs/USB-IMPLEMENTATION-PLAN.md
+++ b/local/docs/USB-IMPLEMENTATION-PLAN.md
@@ -574,7 +574,7 @@ UAS uses 4 endpoints (cmd BULK OUT, status BULK IN, data-in BULK IN, data-out BU
 
 ## 8. P6 — Class driver completeness
 
-**Why this matters:** Red Bear has 6 class drivers, of which only 3 work (usbhubd, usbhidd, usbscsid). The other 3 are 32-line stubs. Plus we're missing CDC NCM (ethernet), USB Audio, USB-serial, and others.
+**Why this matters:** Red Bear has 6 class drivers. usbhubd, usbhidd, usbscsid are proven; redbear-acmd (186 LoC), redbear-ecmd (314 LoC), redbear-usbaudiod (367 LoC) are real but minimal implementations (verified 2026-07-20, reconciling P1-D): ACM covers line coding + DTR/RTS + scheme registration, but the full P6-A surface below (CTS/DSR flow control, break signaling, multi-port modems) is NOT covered yet. CDC NCM, full USB Audio, and USB-serial chip families are still missing entirely.
 
 ### P6-A: CDC ACM (remove the stub)