diff --git a/man7/mq_overview.7 b/man7/mq_overview.7
index c5e5c7e3d..ca2cc6745 100644
--- a/man7/mq_overview.7
+++ b/man7/mq_overview.7
@@ -198,6 +198,33 @@ since Linux 3.5,
 .\" commit 5b5c4d1a1440e94994c73dddbad7be0676cd8b9a
 it is 65,536.
 .TP
+.IR /proc/sys/fs/mqueue/msgsize_default " (since Linux 3.5)"
+This file defines the value used for a new queue's
+.I mq_msgsize
+setting when the queue is created with a call to 
+.BR mq_open (3)
+where
+.I attr
+is specified as NULL.
+The default value for this file is 8192.
+The minimum and maximum are as for
+.IR /proc/sys/fs/mqueue/msgsize_max .
+If
+.IR msgsize_default
+exceeds
+.IR msgsize_max ,
+a new queue's default
+.I mq_msgsize
+value is capped to the
+.I msgsize_max
+limit.
+Up until Linux 2.6.28, the default
+.I mq_msgsize
+was 8192;
+from Linux 2.6.28 to Linux 3.4, the default was the value defined for the
+.I msgsize_max
+limit.
+.TP
 .I /proc/sys/fs/mqueue/msgsize_max
 This file can be used to view and change the ceiling on the
 maximum message size.