ISO image → USB disk image

wiki/src/install/inc/steps/install_gnome_disks.inline.mdwn

@@ -102,7 +102,7 @@
    """]]
 
 1. In the <span class="guilabel">Restore Disk Image</span> dialog, click on
-   the file selector button and choose the ISO image that you downloaded
+   the file selector button and choose the USB disk image that you downloaded
    earlier.
 
 1. Click on the <span class="button">Start Restoring&hellip;</span> button.