add version info

Author: Hannes7eicher

content/hardware/03.nano/boards/nano-esp32/features.md

@@ -24,10 +24,10 @@ This board is Bluetooth® enabled allowing you to control peripheral devices and
 </Feature>
 
 <Feature title="ESP32 Platform" image="mcu">
-The Nano ESP32's Board Package is based on the well maintained & documented <a href="https://github.com/espressif/arduino-esp32">ESP32 core</a> from Espressif.
-<FeatureWrapper>
-  <FeatureLink variant="secondary" title="ESP32 Documentation" url="https://docs.espressif.com/projects/arduino-esp32/en/latest/"/>
-</FeatureWrapper>
+  The Nano ESP32's Board Package is based on the well-maintained & documented <a href="https://github.com/espressif/arduino-esp32">ESP32 core</a> from Espressif, specifically using the 2.x branch with ESP-IDF version v5.1.4.
+  <FeatureWrapper>
+    <FeatureLink variant="secondary" title="ESP32 Documentation" url="https://docs.espressif.com/projects/arduino-esp32/en/latest/"/>
+  </FeatureWrapper>
 </Feature>
 
 <Feature title="USB-C®" image="usb">

content/hardware/03.nano/boards/nano-esp32/tutorials/esp-now/esp-now.md

@@ -11,6 +11,8 @@ tags: [ESP32, Debugging, IDE]
 
 ESP-NOW is a wireless communication protocol developed by Espressif, the company behind the ESP32 microcontroller (MCU). Since the Arduino Nano ESP32 is equipped with that MCU it also supports the ESP-NOW protocol out of the box. It's designed for efficient and low-latency communication between devices, capable of sending up to 250 bytes.
 
+***Note: The Nano ESP32 utilizes the Arduino ESP32 Boards core based on the 2.x branch of the arduino-esp32 core, leveraging ESP-IDF version [v5.1.4](https://docs.espressif.com/projects/esp-idf/en/v5.1.4/esp32/api-reference/network/esp_now.html). Please be aware that functions and features may differ between versions, so ensure you reference the correct documentation for this setup.***
+
 ## Hardware Requirements
 
 ESP-NOW is supported on the following microcontrollers: 

content/hardware/03.nano/boards/nano-esp32/tutorials/getting-started-nano-esp32/getting-started-nano-esp32.md

@@ -11,6 +11,8 @@ To use the [Arduino Nano ESP32](/hardware/nano-esp32) board, you will need to in
 
 To install it, you will need the Arduino IDE, which you can download from the [Arduino Software page](https://www.arduino.cc/en/software). In this guide, we will use the latest version of the IDE 2.
 
+***Note: The Nano ESP32 utilizes the Arduino ESP32 Boards core based on the 2.x branch of the arduino-esp32 core, leveraging ESP-IDF version v5.1.4. Please be aware that functions and features may differ between versions, so ensure you reference the correct documentation for this setup.***
+
 ## Software & Hardware Needed
 
 - [Arduino Nano ESP32](https://store.arduino.cc/nano-esp32)