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-rw-r--r--src/net/infiniband.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/net/infiniband.c b/src/net/infiniband.c
index 369d490a..e71b3bcc 100644
--- a/src/net/infiniband.c
+++ b/src/net/infiniband.c
@@ -554,6 +554,10 @@ void ib_close ( struct ib_device *ibdev ) {
* @v qp Queue pair
* @v gid Multicast GID
* @ret rc Return status code
+ *
+ * Note that this function handles only the local device's attachment
+ * to the multicast GID; it does not issue the relevant MADs to join
+ * the multicast group on the subnet.
*/
int ib_mcast_attach ( struct ib_device *ibdev, struct ib_queue_pair *qp,
struct ib_gid *gid ) {