Use consistent spelling of systemd.condition_first_boot argument

diff --git a/man/machine-id.xml b/man/machine-id.xml
index 4ee100b4735c42942b5dbab2a415ada596c66115..b142d2f0b5d49a85be6b63935dba96a19daf9761 100644 (file)
--- a/man/machine-id.xml
+++ b/man/machine-id.xml
@@ -124,7 +124,7 @@
     are as follows:</para>
 
     <orderedlist>
-      <listitem><para>The kernel command argument <varname>systemd.condition-first-boot=</varname> may be
+      <listitem><para>The kernel command argument <varname>systemd.condition_first_boot=</varname> may be
       used to override the autodetection logic, see
       <citerefentry><refentrytitle>kernel-command-line</refentrytitle><manvolnum>7</manvolnum></citerefentry>.
       </para></listitem>