Mention that picking the correct usb drive is critical

diff --git a/README.rst b/README.rst
index b23905e5dfd5e600b8076529b96677b5dc56da1e..a1dd7ef0a5494e6af8a09c2435d853f088d8bf19 100644 (file)
--- a/README.rst
+++ b/README.rst
@@ -91,6 +91,9 @@ Notice the new device, `sdd`.  It may be called differently on your machine, but
 will likely be named `sdX` where `X` is a letter.  The full name of your usb
 device is `/dev/sdX`.
 
+Be absolutely that you have correctly identified the USB device at this point.
+If you have misidentified it, you will cause irreparable loss of data.
+
 Linux install image
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