From 136502367e077f840bbeb81488db82c55c99cca3 Mon Sep 17 00:00:00 2001
From: Cedric Boudinet <boudinpg@gmail.com>
Date: Fri, 3 Feb 2023 10:46:28 +0100
Subject: [PATCH] doc

---
 docs/modbus_send_raw_request_tid.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/docs/modbus_send_raw_request_tid.md b/docs/modbus_send_raw_request_tid.md
index 26b624e39..69dc4e13c 100644
--- a/docs/modbus_send_raw_request_tid.md
+++ b/docs/modbus_send_raw_request_tid.md
@@ -19,6 +19,8 @@ message, the header or CRC of the selected backend, so `raw_req` must start and
 contain at least a slave/unit identifier and a function code. This function can
 be used to send request not handled by the library.
 
+The tid paramter enables one to specify a transaction identifier.
+
 The public header of libmodbus provides a list of supported Modbus functions
 codes, prefixed by `MODBUS_FC_` (eg. `MODBUS_FC_READ_HOLDING_REGISTERS`), to help
 build of raw requests.