diff --git a/man7/tcp.7 b/man7/tcp.7
index c9652ea76..b3a486b03 100644
--- a/man7/tcp.7
+++ b/man7/tcp.7
@@ -975,6 +975,22 @@ It is possible to peek at out-of-band data using the
 .IR recv (2)
 .B MSG_PEEK
 flag.
+
+Since version 2.4, Linux supports the use of
+.B MSG_TRUNC
+in the
+.I flags
+argument of
+.BR recv (2)
+(and
+.BR recvmsg (2)).
+This flag causes the received bytes of data to be discarded,
+rather than passed back in a caller-supplied buffer.
+Since Linux 2.4.4,
+.BR MSG_PEEK
+also has this effect when used in conjunction with
+.BR MSG_OOB
+to receive out-of-band data.
 .SS Ioctls
 These following
 .BR ioctl (2)