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-rw-r--r--doc/protocol.rst4
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/protocol.rst b/doc/protocol.rst
index acc2d3c47..618e784ec 100644
--- a/doc/protocol.rst
+++ b/doc/protocol.rst
@@ -732,6 +732,10 @@ The music database
count group artist
count title Echoes group artist
+ A group with an empty value contains counts of matching song which
+ don't this group tag. It exists only if at least one such song is
+ found.
+
.. _command_find:
:command:`find {FILTER} [sort {TYPE}] [window {START:END}]`