Commit bc8dd572 authored by Max Kellermann's avatar Max Kellermann

doc/protocol.xml: document status/volume=-1

Closes #107
parent f4f461b8
......@@ -445,7 +445,9 @@
<listitem>
<para>
<varname>volume</varname>:
<returnvalue>0-100</returnvalue>
<returnvalue>0-100</returnvalue> or
<returnvalue>-1</returnvalue> if the volume cannot
be determined
</para>
</listitem>
<listitem>
......
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