Update esp-idf_component.rst

Author: VojtechBartoska

Diff for: docs/source/esp-idf_component.rst

@@ -10,6 +10,9 @@ For a simplified method, see `lib-builder <lib_builder>`_.
 Installation
 ------------
 
+.. note::
+Latest Arduino Core ESP32 version is now compatible with [ESP-IDF v4.4](https://github.com/espressif/esp-idf/tree/release/v4.4). Please consider this compability when using Arduino as component in ESP-IDF.
+
 - Download and install `ESP-IDF <https://github.com/espressif/esp-idf>`_.
 - Create blank idf project (from one of the examples).
 - In the project folder, create a new folder called `components` and clone this repository inside the new created folder.