diff --git a/share/man/man4/ix.4 b/share/man/man4/ix.4
--- a/share/man/man4/ix.4
+++ b/share/man/man4/ix.4
@@ -78,6 +78,8 @@
 .Pp
 .Bl -bullet -compact
 .It
+Intel(R) Ethernet E610
+.It
 Intel(R) Ethernet X553
 .It
 Intel(R) Ethernet X552
@@ -130,6 +132,114 @@
 Vary the interrupt rate over time based on the traffic for
 that interrupt vector.
 .El
+.\"
+.Sh FEATURES
+.Ss DEBUG DUMP
+Intel(R) E610 Ethernet Controller devices support debug dump, which allows
+obtaining runtime register values from the firmware for "clusters" of
+events and then write the results to a single dump file, for debugging
+complicated issues in the field.
+.\"
+This debug dump contains a snapshot of the device and its existing hardware
+configuration, such as switch tables, transmit scheduler tables, and other
+information. Debug dump captures the current state of the specified cluster(s)
+and is a stateless snapshot of the whole device.
+.\"
+.Pp
+Note:
+.Bl -bullet -compact
+.It
+The contents of the debug dump are not human-readable. Contact
+Customer Support to decode the file.
+.It
+Debug dump is per device, not per Physical Function (PF).
+.It
+Debug dump writes all information to a single file.
+.El
+.\"
+.Pp
+To generate a debug dump file in
+.Fx ,
+do the following:
+.\"
+.Bl -enum -compact
+.It
+Specify the cluster(s) to include in the dump file, using a bitmask and the
+following command:
+.Pp
+.Dl sysctl Va dev.ix.<interface #>.debug.dump.clusters Ns = Ns Ar <bitmask>
+.Pp
+.\"
+To print the complete cluster bitmask and parameter list to the screen, pass
+the
+.Fl d
+argument. For example:
+.Pp
+.Dl sysctl -d Va dev.ix.0.debug.dump.clusters
+.Pp
+.\"
+Possible bitmask values for
+.Va clusters
+are:
+.Bl -bullet -compact
+.It
+0x1 - Link
+.It
+0x2 - Full CSR Space, excluding RCW registers
+.El
+.\"
+For example, to dump the Link cluster, use the following:
+.Pp
+.Dl sysctl Va dev.ix.0.debug.dump.clusters Ns = Ns Ar 0x1
+.Pp
+.\"
+To dump full CSR Space, excluding RCW registers, use the following:
+.Pp
+.Dl sysctl Va dev.ix.0.debug.dump.clusters Ns = Ns Ar 0x2
+.Pp
+.\"
+To dump all clusters, use the following:
+.Pp
+.Dl sysctl Va dev.ix.0.debug.dump.clusters Ns = Ns Ar 0
+.Pp
+.\"
+.Pp
+Note: Using 0 will skip Manageability Transactions data.
+.\"
+When a cluster is not specified, the driver will dump all clusters to a
+single file.
+.\"
+.It
+Issue the debug dump command using the
+.Va dev.ix.<interface #>.debug.dump.dump
+sysctl:
+.Pp
+.Dl sysctl -b Va dev.ix.<interface #>.debug.dump.dump Ns = Ns Ar 1 No > dump.bin
+.Pp
+.\"
+.Pp
+Note:
+.Bl -bullet -compact
+.It
+The driver will not receive the command if the sysctl is not set to "1".
+.It
+Replace
+.Dq dump.bin
+above with the desired file name.
+.It
+If no clusters were specified, the dump file will include information
+about all clusters.
+.El
+.\"
+.It
+To clear the clusters bitmap before a subsequent debug dump and then do the
+dump:
+.Pp
+.Dl sysctl Va dev.ix.0.debug.dump.clusters Ns = Ns Ar 0
+.Dl sysctl Va dev.ix.0.debug.dump.dump Ns = Ns Ar 1
+.Pp
+.El
+.\"
 .Sh DIAGNOSTICS
 .Bl -diag
 .It "ix%d: Unable to allocate bus resource: memory"