<listitem><para>Create a new home directory/user account of the specified name. Use the various
user record property options (as documented above) to control various aspects of the home directory
- and its user accounts.</para></listitem>
+ and its user accounts.</para>
+
+ <para>The specified user name should follow the strict syntax described on <ulink
+ url="https://systemd.io/USER_NAMES">User/Group Name Syntax</ulink>.</para></listitem>
</varlistentry>
<varlistentry>