From 92c34dddba169107c0699bdd118b70e14396d0f1 Mon Sep 17 00:00:00 2001
From: proddy <paul@derbyshire.nl>
Date: Sat, 3 Jan 2026 13:56:11 +0100
Subject: [PATCH] add comment

---
 src/core/system.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/core/system.cpp b/src/core/system.cpp
index 6363a76da..3d40f8e19 100644
--- a/src/core/system.cpp
+++ b/src/core/system.cpp
@@ -2843,6 +2843,7 @@ void System::set_valid_system_gpios() {
 #elif CONFIG_IDF_TARGET_ESP32
     // 1 and 3 are UART0 pins, but used for some eth-boards (BBQKees-E32, OlimexPOE)
     // 32-39 is ADC1, input only
+    // 25 and 26 are DAC (Digital-to-Analog Converter) pins
     if (ESP.getPsramSize() > 0) {
         // if psram is enabled remove pins 16 and 17 from the list
         valid_system_gpios_ = string_range_to_vector("0-5, 12-15, 18-19, 23, 25-27, 32-39");