diff --git a/man/systemd.netdev.xml b/man/systemd.netdev.xml
index 0bbfc611f80..4cb3258c111 100644
--- a/man/systemd.netdev.xml
+++ b/man/systemd.netdev.xml
@@ -529,7 +529,7 @@
       <varlistentry>
         <term><varname>Id=</varname></term>
         <listitem>
-          <para>The VXLAN ID to use.</para>
+          <para>The VXLAN ID to use. Takes a number in the range 1-16777215.</para>
         </listitem>
       </varlistentry>
       <varlistentry>