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-rw-r--r--include/net/neighbour.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index 09f9fc60a779..a0d42a54cfb2 100644
--- a/include/net/neighbour.h
+++ b/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)