diff --git a/Upgrading-Firmware.md b/Upgrading-Firmware.md
index 92bd470..012d4ef 100644
--- a/Upgrading-Firmware.md
+++ b/Upgrading-Firmware.md
@@ -27,5 +27,7 @@ Balrog-kun contributed a note in [issue 11](https://github.com/Ralim/ts100/issue
 
 > So I disabled automounting with `$ gsettings set org.gnome.desktop.media-handling automount false` (or as indicated by googling "disable gnome automount"), unplugged and replugged, then mounted the volume as _msdos_ instead of _vfat _type using, in my case, ` mkdir tmp; mount -t msdos /dev/sdc tmp` (as root) and `cp /home/user/Downloads/ts100.hex tmp/TS100.HEX; sync`. I'm not sure which part is the key to making it work really, possibly the msdos FS type. Automounting can be re-enabled once you see 1.08 on the TS-100 display.
 
+Note: The destination file name must be all caps.
+
 ## However
 User doegox has commented on Issue #11 that they could not get the unit's DFU updated to work under Linux. So that this point it is unknown if there is a reliable method that works under Linux.
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