diff --git a/man7/tcp.7 b/man7/tcp.7
index 40bb17ce9..fadfd41b7 100644
--- a/man7/tcp.7
+++ b/man7/tcp.7
@@ -435,6 +435,18 @@ will allocate.
 This value overrides any other limits
 imposed by the kernel.
 .TP
+.IR tcp_no_metrics_save " (Boolean; default: disabled; since Linux 2.6.6)"
+.\" The following is from 2.6.28-rc4: Documentation/networking/ip-sysctl.txt
+By default, TCP saves various connection metrics in the route cache
+when the connection closes, so that connections established in the
+near future can use these to set initial conditions.
+Usually, this increases overall performance,
+but it may sometimes cause performance
+degradation.
+If
+.I tcp_no_metrics_save
+is enabled, TCP will not cache metrics on closing connections.
+.TP
 .IR tcp_orphan_retries " (integer; default: 8)"
 The maximum number of attempts made to probe the other
 end of a connection which has been closed by our end.