diff --git a/man7/arp.7 b/man7/arp.7
index 731378307..7b96c5648 100644
--- a/man7/arp.7
+++ b/man7/arp.7
@@ -247,6 +247,12 @@ Defaults to 64.
 .\" Precisely: 2.1.79
 The number of jiffies to delay before retransmitting a request.
 Defaults to 1 second.
+This file is now obsolete in favour of
+.IR retrans_time_ms .
+.TP
+.IR retrans_time_ms " (since Linux 2.6.12)"
+The number of milliseconds to delay before retransmitting a request.
+Defaults to 1000 milliseconds.
 .TP
 .IR ucast_solicit " (since Linux 2.2)"
 .\" Precisely: 2.1.79