diff --git a/formatter/README.md b/formatter/README.md
index 4cb0a07..1f2d23e 100644
--- a/formatter/README.md
+++ b/formatter/README.md
@@ -2,5 +2,6 @@ nRF formatter tools
 
 - QSPI is formatted for all supported boards
 - Watch out for softdevice version! Flashing the wrong version can corrupt the node and you'll need a full bootloader reflash with adafruit-nrfutil!
+  - You can check what softdevice versio you use if you open INFO_UF2.TXT on the storage drive when in DFU mode. Bootloader should say "sxxx 6.x.x" for v6 and "sxxx 7.x.x" for v7
 - Formatter output logs from the process over serial
-- After format, it puts back the device to Mass Storage DFU mode
\ No newline at end of file
+- After format, it puts back the device to Mass Storage DFU mode