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-rw-r--r--doc/protocol.rst3
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/protocol.rst b/doc/protocol.rst
index 4818b55fb..e0d750f29 100644
--- a/doc/protocol.rst
+++ b/doc/protocol.rst
@@ -154,6 +154,9 @@ of:
``AlbumArtist`` does not exist.
``VALUE`` is what to find.
+- ``(TAG contains 'VALUE')`` checks if the given value is a substring
+ of the tag value.
+
- ``(TAG =~ 'VALUE')`` and ``(TAG !~ 'VALUE')`` use a Perl-compatible
regular expression instead of doing a simple string comparison.
(This feature is only available if :program:`MPD` was compiled with