- <td>Specifies which tool tags to display on the second row. <tt>shell</tt> launches an EFI shell, <tt>gptsync</tt> launches a tool that creates a hybrid MBR, <tt>about</tt> displays information about the program, <tt>exit</tt> terminates rEFInd, <tt>shutdown</tt> shuts down the computer (or reboots it, on UEFI PCs), and <tt>reboot</tt> reboots the computer. The tags appear in the order in which you specify them. The default is <tt>shell, about, shutdown, reboot</tt>.</td>
+ <td>Specifies which tool tags to display on the second row. <tt>shell</tt> launches an EFI shell, <tt>gptsync</tt> launches a tool that creates a hybrid MBR, <tt>about</tt> displays information about the program, <tt>exit</tt> terminates rEFInd, <tt>shutdown</tt> shuts down the computer (or reboots it, on UEFI PCs), and <tt>reboot</tt> reboots the computer. The tags appear in the order in which you specify them. The default is <tt>shell, about, shutdown, reboot</tt>. Note that the <tt>shell</tt> and <tt>gptsync</tt> options both require the presence of programs not included with rEFInd; see the <a href="installing.html#addons">"Installing Additional Components"</a> section of the <a href="installing.html">Installing rEFInd</a> page for pointers to these programs.</td>