diff --git a/tutorial/dd_command_flash_usb.org b/tutorial/dd_command_flash_usb.org
index 59a4d9f..334228f 100644
--- a/tutorial/dd_command_flash_usb.org
+++ b/tutorial/dd_command_flash_usb.org
@@ -13,14 +13,23 @@ An example with parabola:
 
 ** List blocks
 
+Please note that you should take a look to the USB device before create the
+bootable device.
+
 #+begin_src sh
   lsblk
 #+end_src
 
- * First, obtain a ISO image:
-   https://wiki.parabola.nu/Get_Parabola
- * Then, open a shell and use the command
-   
+Then, identify the device id (sdb1 in the example)
+
+** Obtain a ISO image:
+
+- [[https://trisquel.info/en/download][Trisquel]]
+- [[https://wiki.parabola.nu/Get_Parabola][Parabola GNU-Linux]]
+- [[https://pureos.net/download/][PureOS]]
+
+** open a shell and use dd to flash the device
+
 #+begin_example sh
   sudo dd if=/home/user/Documents/parabola-2016.11.03-dual.iso of=/dev/sdb1
 #+end_example
@@ -29,4 +38,5 @@ The ISO image is copied to "sdb1" (USB volume)
 
 * Footnotes
 
-[fn:1] The USB should be formatted as FAT 32 
+[fn:1] The USB should be formatted as FAT 32. You may use [[xhttps://gparted.org/][GParted]] for that
+purpose