man: bootctl set-default/oneshot accept an empty string

diff --git a/man/bootctl.xml b/man/bootctl.xml
index a6137a065935b9960396014954a3c299628e9379..e64c241b6d4622d61150793faf2680137d772fe3 100644 (file)
--- a/man/bootctl.xml
+++ b/man/bootctl.xml
@@ -112,6 +112,7 @@
         These special IDs are primarily useful as a quick way to persistently make the currently booted boot loader
         entry the default choice, or to upgrade the default boot loader entry for the next boot to the default boot
         loader entry for all future boots, but may be used for other operations too.
+        When an emptry string ("") is specified as an ID, then the corresponding EFI variable will be unset.
         </para></listitem>
       </varlistentry>