diff --git a/[refs] b/[refs]
index b75191cc33ba..b97a79e66f37 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 6e9766317fd51a33a32c65d2b76a6bde3227bbbd
+refs/heads/master: 662a889608dfabbb1b4954b172a6872a25dc8f90
diff --git a/trunk/drivers/block/aoe/aoechr.c b/trunk/drivers/block/aoe/aoechr.c
index ed57a890c643..2bf6273e6779 100644
--- a/trunk/drivers/block/aoe/aoechr.c
+++ b/trunk/drivers/block/aoe/aoechr.c
@@ -39,6 +39,11 @@ struct ErrMsg {
 };
 
 static DEFINE_MUTEX(aoechr_mutex);
+
+/* A ring buffer of error messages, to be read through
+ * "/dev/etherd/err".  When no messages are present,
+ * readers will block waiting for messages to appear.
+ */
 static struct ErrMsg emsgs[NMSG];
 static int emsgs_head_idx, emsgs_tail_idx;
 static struct completion emsgs_comp;