for an example how to use the cleanup attribute.</para>
<para><function>sd_bus_message_ref()</function> and <function>sd_bus_message_unref()</function>
- execute no operation if the passed in bus object address is
+ execute no operation if the passed in bus message object address is
<constant>NULL</constant>. <function>sd_bus_message_unrefp()</function> will first dereference
its argument, which must not be <constant>NULL</constant>, and will execute no operation if
<emphasis>that</emphasis> is <constant>NULL</constant>.