doc/protocol.rst: mention that unknown lines may be omitted

685b7882 · Max Kellermann · 060908d5 · 685b7882
Commit 685b7882 authored Nov 12, 2018 by Max Kellermann
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--- a/doc/protocol.rst
+++ b/doc/protocol.rst
@@ -419,6 +419,10 @@ Querying ``MPD``'s status
    - ``updating_db``: ``job id``
    - ``error``: if there is an error, returns message here

+    :program:`MPD` may omit lines which have no (known) value.  Older
+    :program:`MPD` versions used to have a "magic" value for
+    "unknown", e.g. ":samp:`volume: -1`".
+
 :command:`stats`
    Displays statistics.