From 0af5ec6b20380f6073d8e3bf7589e37cbc76146b Mon Sep 17 00:00:00 2001
From: Evan Feenstra <evanfeenstra@gmail.com>
Date: Mon, 16 Oct 2023 13:54:26 -0700
Subject: [PATCH] more doc

---
 sphinx-ffi/onion.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sphinx-ffi/onion.md b/sphinx-ffi/onion.md
index f62fb9f..9a90734 100644
--- a/sphinx-ffi/onion.md
+++ b/sphinx-ffi/onion.md
@@ -1,3 +1,11 @@
+### sign a timestamp (to connect to MQTT)
+
+**`sign_msg(seed: String, time: String)`**
+
+- seed: 32-byte hex
+- time: 13-digit timestamp (milliseconds)
+- returns hex-encoded signature
+
 ### onion messages
 
 **`create_onion(seed: String, time: String, hops: String, payload: Bytes)`**