doc/protocol.rst: mention that unknown lines may be omitted
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		@@ -419,6 +419,10 @@ Querying ``MPD``'s status
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    - ``updating_db``: ``job id``
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					    - ``updating_db``: ``job id``
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    - ``error``: if there is an error, returns message here
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					    - ``error``: if there is an error, returns message here
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					    :program:`MPD` may omit lines which have no (known) value.  Older
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					    :program:`MPD` versions used to have a "magic" value for
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					    "unknown", e.g. ":samp:`volume: -1`".
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:command:`stats`
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					:command:`stats`
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    Displays statistics.
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					    Displays statistics.
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