From 66e80fe13bf4e22e83d48afda879a0557e2c0bfd Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Wed, 14 Jan 2026 16:28:16 -1000
Subject: [PATCH] Update
 esphome/components/modbus_controller/modbus_controller.h

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
---
 esphome/components/modbus_controller/modbus_controller.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/esphome/components/modbus_controller/modbus_controller.h b/esphome/components/modbus_controller/modbus_controller.h
index 466598e9cd..111b0d574e 100644
--- a/esphome/components/modbus_controller/modbus_controller.h
+++ b/esphome/components/modbus_controller/modbus_controller.h
@@ -286,7 +286,7 @@ class ServerRegister {
         return std::to_string(value);
       case SensorValueType::FP32_R:
       case SensorValueType::FP32: {
-        // max 48: float with %.1f can be up to 41 chars (3.4e38 → 39 digits + sign + decimal + 1 digit) + null
+        // max 48: float with %.1f can be up to 42 chars incl. null (3.4e38 → 38 integer digits + decimal point + 1 decimal digit + optional sign)
         char buf[48];
         snprintf(buf, sizeof(buf), "%.1f", bit_cast<float>(static_cast<uint32_t>(value)));
         return buf;