diff --git a/configs/esp32-core/README.txt b/configs/esp32-core/README.txt
index 4420664769..4a630c3f1e 100644
--- a/configs/esp32-core/README.txt
+++ b/configs/esp32-core/README.txt
@@ -44,6 +44,10 @@ STATUS
 
     CONFIG_SUPPRESS_UART_CONFIG=y
 
+  The NuttX fork, TizenRT, has taken the NuttX ESP32 code and taken it futher.
+  Refer to https://github.com/Samsung/TizenRT/tree/master/os/arch/xtensa for
+  the current status.
+
 ESP32 Features
 ==============