1 files changed, 7 insertions, 0 deletions

diff --git a/Documentation/networking/ipvs-sysctl.txt b/Documentation/networking/ipvs-sysctl.txt
index f2a2488f1bf3..9573d0c48c6e 100644
--- a/Documentation/networking/ipvs-sysctl.txt
+++ b/Documentation/networking/ipvs-sysctl.txt
@@ -15,6 +15,13 @@ amemthresh - INTEGER
         enabled and the variable is automatically set to 2, otherwise
         the strategy is disabled and the variable is  set  to 1.
 
+backup_only - BOOLEAN
+        0 - disabled (default)
+        not 0 - enabled
+
+        If set, disable the director function while the server is
+        in backup mode to avoid packet loops for DR/TUN methods.
+
 conntrack - BOOLEAN
         0 - disabled (default)
         not 0 - enabled