From a22adfd3d3874cee036f78dde18e09fba2f57edc Mon Sep 17 00:00:00 2001
From: Peter Hinch <peter@hinch.me.uk>
Date: Tue, 15 Jun 2021 13:04:36 +0100
Subject: [PATCH] README: add ESP32 URL.

---
 README.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index e2df37f..03c6c36 100644
--- a/README.md
+++ b/README.md
@@ -102,7 +102,8 @@ Various tools are available to manage the device's storage via USB. I use
 ## 2.1 ESP32
 
 Pinout diagram for the reference board with notes and warnings about reserved
-pins etc. See [this doc](./ESP32/ESP32-Devkit-C-pinout.pdf).
+pins etc. See [this doc](./ESP32/ESP32-Devkit-C-pinout.pdf). See also this
+excellent [resource](https://randomnerdtutorials.com/esp32-pinout-reference-gpios/).
 
 ## 2.2 SSD1306