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-rw-r--r--src/event_pipe.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/event_pipe.h b/src/event_pipe.h
index 33f92d440..4614ef25c 100644
--- a/src/event_pipe.h
+++ b/src/event_pipe.h
@@ -41,6 +41,9 @@ enum pipe_event {
/** SIGHUP received: reload configuration, roll log file */
PIPE_EVENT_RELOAD,
+ /** a hardware mixer plugin has detected a change */
+ PIPE_EVENT_MIXER,
+
PIPE_EVENT_MAX
};