ipv6: document ndisc_notify in networking/ip-sysctl.txt

I slipped in a new sysctl without proper documentation. I would like to
make up for this now.

Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index dd52d516cb89..ac1710ef21af 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -1331,6 +1331,12 @@ force_tllao - BOOLEAN
         race condition where the sender deletes the cached link-layer address
         prior to receiving a response to a previous solicitation."
 
+ndisc_notify - BOOLEAN
+        Define mode for notification of address and device changes.
+        0 - (default): do nothing
+        1 - Generate unsolicited neighbour advertisements when device is brought
+            up or hardware address changes.
+
 icmp/*:
 ratelimit - INTEGER
         Limit the maximal rates for sending ICMPv6 packets.