diff --git a/ports/esp32/README.md b/ports/esp32/README.md
index c7d40070d1..42cd588171 100644
--- a/ports/esp32/README.md
+++ b/ports/esp32/README.md
@@ -75,6 +75,12 @@ $ source export.sh   # (or export.bat on Windows)
 The `install.sh` step only needs to be done once. You will need to source
 `export.sh` for every new session.
 
+**Note:** If you are building MicroPython for the ESP32-S2, ESP32-C3 or ESP32-S3,
+please ensure you are using the following required IDF versions:
+- ESP32-S3 currently requires latest `master`, but eventually `v4.4` or later when
+  it's available.
+- ESP32-S2 and ESP32-C3 require `v4.3.1` or later.
+
 Building the firmware
 ---------------------