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diff --git a/usr.sbin/bhyve/bhyve.8 b/usr.sbin/bhyve/bhyve.8
--- a/usr.sbin/bhyve/bhyve.8
+++ b/usr.sbin/bhyve/bhyve.8
@@ -25,7 +25,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd December 23, 2025
+.Dd December 26, 2025
.Dt BHYVE 8
.Os
.Sh NAME
@@ -551,6 +551,7 @@
is not specified, the MAC address is derived from a fixed OUI, and the
remaining bytes from an MD5 hash of the slot and function numbers and
the device name.
+If specified, it must be a unicast MAC address.
.Pp
The MAC address is an ASCII string in
.Xr ethers 5
diff --git a/usr.sbin/bhyve/bhyve_config.5 b/usr.sbin/bhyve/bhyve_config.5
--- a/usr.sbin/bhyve/bhyve_config.5
+++ b/usr.sbin/bhyve/bhyve_config.5
@@ -517,8 +517,10 @@
.It Sy Name Ta Sy Format Ta Sy Default Ta Sy Description
.It Va mac Ta MAC address Ta generated Ta
MAC address.
-If an explicit address is not provided,
-a MAC address is generated from a hash of the device's PCI address.
+If not specified, the MAC address is derived from a fixed OUI, and the
+remaining bytes from an MD5 hash of the slot and function numbers and
+the device name.
+If specified, it must be a unicast MAC address.
.El
.Ss Frame Buffer Settings
.Bl -column "password" "[IP:]port" "127.0.0.1:5900"
@@ -746,8 +748,10 @@
.It Sy Name Ta Sy Format Ta Sy Default Ta Sy Description
.It Va mac Ta MAC address Ta generated Ta
MAC address.
-If an explicit address is not provided,
-a MAC address is generated from a hash of the device's PCI address.
+If not specified, the MAC address is derived from a fixed OUI, and the
+remaining bytes from an MD5 hash of the slot and function numbers and
+the device name.
+If specified, it must be a unicast MAC address.
.It Va mtu Ta integer Ta 1500 Ta
The largest supported MTU advertised to the guest.
.El

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