diff --git a/[refs] b/[refs]
index a785fc86f9da..b12f734b3bfc 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 9993e7d313e80bdc005d09c7def91903e0068f07
+refs/heads/master: 39971554d3469b48154f34257ad4a35081b7ee40
diff --git a/trunk/include/net/neighbour.h b/trunk/include/net/neighbour.h
index 09f9fc60a779..a0d42a54cfb2 100644
--- a/trunk/include/net/neighbour.h
+++ b/trunk/include/net/neighbour.h
@@ -26,6 +26,10 @@
 #include <linux/sysctl.h>
 #include <net/rtnetlink.h>
 
+/*
+ * NUD stands for "neighbor unreachability detection"
+ */
+
 #define NUD_IN_TIMER	(NUD_INCOMPLETE|NUD_REACHABLE|NUD_DELAY|NUD_PROBE)
 #define NUD_VALID	(NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY)
 #define NUD_CONNECTED	(NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE)