From ec05692f0db5394c1d2d7c9097be9196c991a781 Mon Sep 17 00:00:00 2001
From: tomaszduda23 <tomaszduda23@gmail.com>
Date: Sun, 4 Jan 2026 01:12:31 +0100
Subject: [PATCH] [nrf52] add printk doc (#12839)

---
 esphome/components/logger/logger_zephyr.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/esphome/components/logger/logger_zephyr.cpp b/esphome/components/logger/logger_zephyr.cpp
index 330dfa96ec..41f53beec0 100644
--- a/esphome/components/logger/logger_zephyr.cpp
+++ b/esphome/components/logger/logger_zephyr.cpp
@@ -66,6 +66,8 @@ void Logger::pre_setup() {
 void HOT Logger::write_msg_(const char *msg, size_t len) {
   // Single write with newline already in buffer (added by caller)
 #ifdef CONFIG_PRINTK
+  // Requires the debug component and an active SWD connection.
+  // It is used for pyocd rtt -t nrf52840
   k_str_out(const_cast<char *>(msg), len);
 #endif
   if (this->uart_dev_ == nullptr) {