diff --git a/README.md b/README.md
index a214a25b1..4210cf562 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,48 @@
 This is a [USB DFU](https://www.usb.org/document-library/device-firmware-upgrade-11-new-version-31-aug-2004) (DFU mode) implementation for [ESP32-S2](https://www.espressif.com/en/products/socs/esp32-s2) based on [tinyUSB](https://docs.tinyusb.org/en/latest/index.html).
 It allows flashing the firmware using [dfu-util](http://dfu-util.sourceforge.net/).
 
+background
+==========
+
+ESP-ROM
+-------
+
+The ESP-S2 comes with a ROM bootloader that already allows you to flash over USB using the serial CDC ACM profile.
+But this method does not let you restart into the main firmware.
+The ROM bootloader USB stack even offers DFU capability, and you can flash using dfu-util.
+But this one also does not let you restart into the main firmware.
+
+To flash using USB serial (can't restart the device):
+
+~~~
+idf.py -p /dev/ttyACM0 flash
+...
+WARNING: ESP32-S2 chip was placed into download mode using GPIO0.
+esptool.py can not exit the download mode over USB. To run the app, reset the chip manually.
+To suppress this note, set --after option to 'no_reset'.
+~~~
+
+And to [flash using DFU](https://docs.espressif.com/projects/esp-idf/en/latest/esp32s2/api-guides/dfu.html):
+
+~~~
+# generate the DFU binary (not the same as the usual flash binary)
+idf.py dfu
+dfu-util --device 303a:0002 --download build/dfu.bin
+# or
+idf.py dfu-flash
+~~~
+
+Note: after detaching, the bootloader claims for be in runtime mode, but this is still the bootloader, and not the flashed firmware.
+
+mode switch
+-----------
+
+To switch from the ESP32-S2 ROM bootloader back to the firmware flashed over USB, you need to press the reset button.
+This is cumbersome when developing firmware, and sometimes impossible if the board is encased or installed remotely.
+
+This USB DFU implementation allows to switch back to runtime mode without pressing a button.
+The runtime firmware can also reboot into the DFU mode without pressing a button.
+
 install
 =======
 
@@ -94,36 +136,6 @@ Feel free to reuse the 'partitions.csv' file as example.
 alternatives
 ============
 
-ESP-ROM
--------
-
-The ESP-S2 comes with a ROM bootloader that already allows you to flash over USB using the serial CDC ACM profile.
-But this method does not let you restart into the main firmware.
-The ROM bootloader USB stack even offers DFU capability, and you can flash using dfu-util.
-But this one also does not let you restart into the main firmware.
-
-To flash using USB serial (can't restart the device):
-
-~~~
-idf.py -p /dev/ttyACM0 flash
-...
-WARNING: ESP32-S2 chip was placed into download mode using GPIO0.
-esptool.py can not exit the download mode over USB. To run the app, reset the chip manually.
-To suppress this note, set --after option to 'no_reset'.
-~~~
-
-And to [flash using DFU](https://docs.espressif.com/projects/esp-idf/en/latest/esp32s2/api-guides/dfu.html):
-
-~~~
-# generate the DFU binary (not the same as the usual flash binary)
-idf.py dfu
-dfu-util --device 303a:0002 --download build/dfu.bin
-# or
-idf.py dfu-flash
-~~~
-
-Note: after detaching, the bootloader claims for be in runtime mode, but this is still the bootloader, and not the flashed firmware.
-
 TinyUF2
 -------