From 0880d0b01a016177f047cc07a6a11d5e3639d095 Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Fri, 5 Sep 2025 18:47:55 -0400
Subject: usb: add nack to protocol

---
 doc/protocol | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'doc/protocol')

diff --git a/doc/protocol b/doc/protocol
index 2273f40..5d2cb65 100644
--- a/doc/protocol
+++ b/doc/protocol
@@ -1,5 +1,5 @@
 <command> ::= <opcode> " " <args> "\n"
-<response> ::= <retval> "\n"
+<response> ::= (<retval>|"nack") "\n"
 
 Echo:
 <opcode> ::= "e"
-- 
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