diff --git a/man/systemd-nspawn.xml b/man/systemd-nspawn.xml
index ac19e5e7de..ab3c44f37e 100644
--- a/man/systemd-nspawn.xml
+++ b/man/systemd-nspawn.xml
@@ -398,6 +398,7 @@
       </varlistentry>
 
       <varlistentry>
+        <term><option>-S</option></term>
         <term><option>--slice=</option></term>
 
         <listitem><para>Make the container part of the specified slice, instead of the default