addr_gen_mode was introduced in without documentation, add it now.

Fixes: d35a00b8e33d ("net/ipv6: allow sysctl to change link-local address 
generation mode")
Signed-off-by: Sabrina Dubroca <s...@queasysnail.net>
---
 Documentation/networking/ip-sysctl.txt | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/networking/ip-sysctl.txt 
b/Documentation/networking/ip-sysctl.txt
index ce8fbf5aa63c..c6df84be12f9 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -1834,6 +1834,16 @@ stable_secret - IPv6 address
 
        By default the stable secret is unset.
 
+addr_gen_mode - INTEGER
+       Defines how link-local and autoconf addresses are generated.
+
+       0: generate address based on EUI64 (default)
+       1: do no generate a link-local address, use EUI64 for addresses 
generated
+          from autoconf
+       2: generate stable privacy addresses, using the secret from
+          stable_secret (RFC7217)
+       3: generate stable privacy addresses, using a random secret if unset
+
 drop_unicast_in_l2_multicast - BOOLEAN
        Drop any unicast IPv6 packets that are received in link-layer
        multicast (or broadcast) frames.

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