<funcdef>int sd_bus_message_append</funcdef>
<paramdef>sd_bus_message *<parameter>m</parameter></paramdef>
<paramdef>const char *<parameter>types</parameter></paramdef>
- <paramdef>...</paramdef>
+ <paramdef>…</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
</tgroup>
</table>
+ <para>For types "s" and "g" (unicode string or signature), the pointer may be
+ <constant>NULL</constant>, which is equivalent to an empty string. See
+ <citerefentry><refentrytitle>sd_bus_message_append_basic</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ for the precise interpretation of those and other types.</para>
+
</refsect1>
<refsect1>
</para>
<programlisting>sd_bus_message *m;
-...
+…
sd_bus_message_append(m, "s", "a string");</programlisting>
<para>Append all types of integers:</para>