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

Closes #107
2017-09-04 08:15:41 +02:00 · 2017-09-04 08:15:41 +02:00 · bc8dd57236
commit bc8dd57236
parent f4f461b8bb
1 changed files with 3 additions and 1 deletions
--- a/doc/protocol.xml
+++ b/doc/protocol.xml
@ -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>