X-Git-Url: http://git.efficios.com/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fust-app.h;h=7cc0d10aad3eeea499a23da90eefee78374b7a29;hp=c3e37e0712b69b49274c1d6b6b16df30785d7343;hb=dda154b86423a8d6a52042652fd34ed7288f4ed8;hpb=fa27abe8c16d7d47a901a8905e7cfd08c2e366d7

diff --git a/src/bin/lttng-sessiond/ust-app.h b/src/bin/lttng-sessiond/ust-app.h
index c3e37e071..7cc0d10aa 100644
--- a/src/bin/lttng-sessiond/ust-app.h
+++ b/src/bin/lttng-sessiond/ust-app.h
@@ -137,7 +137,11 @@ struct ust_app_channel {
 	int handle;
 	/* Channel and streams were sent to the UST tracer. */
 	int is_sent;
-	/* Unique key used to identify the channel on the consumer side. */
+	/*
+	 * Unique key used to identify the channel on the consumer side.
+	 * 0 is a reserved 'invalid' value used to indicate that the consumer
+	 * does not know about this channel (i.e. an error occured).
+	 */
 	uint64_t key;
 	/* Id of the tracing channel set on creation. */
 	uint64_t tracing_channel_id;