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-rw-r--r--Documentation/networking/ip-sysctl.txt1
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 59afc9a10b4f..13bbac50dc8b 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -451,6 +451,7 @@ tcp_recovery - INTEGER
RACK: 0x1 enables the RACK loss detection for fast detection of lost
retransmissions and tail drops.
RACK: 0x2 makes RACK's reordering window static (min_rtt/4).
+ RACK: 0x4 disables RACK's DUPACK threshold heuristic
Default: 0x1