diff --git a/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vfsops.c b/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vfsops.c
--- a/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vfsops.c
+++ b/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vfsops.c
@@ -100,7 +100,7 @@
 static int zfs_jailparam_slot;
 
 SYSCTL_JAIL_PARAM_SYS_NODE(zfs, CTLFLAG_RW, "Jail ZFS parameters");
-SYSCTL_JAIL_PARAM(_zfs, mount_snapshot, CTLTYPE_INT | CTLFLAG_RW, "I",
+SYSCTL_JAIL_PARAM(_zfs, mount_snapshot, CTLTYPE_INT | CTLFLAG_RW, "B",
 	"Allow mounting snapshots in the .zfs directory for unjailed datasets");
 
 SYSCTL_NODE(_vfs_zfs, OID_AUTO, version, CTLFLAG_RD, 0, "ZFS versions");
diff --git a/usr.sbin/jail/jail.8 b/usr.sbin/jail/jail.8
--- a/usr.sbin/jail/jail.8
+++ b/usr.sbin/jail/jail.8
@@ -23,7 +23,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd March 16, 2024
+.Dd June 19, 2024
 .Dt JAIL 8
 .Os
 .Sh NAME
@@ -776,6 +776,14 @@
 Allow access to SYSV IPC semaphore and shared memory primitives, in the
 same manner as
 .Va sysvmsg .
+.It Va zfs.mount_snapshot
+Allow jailed users to access the contents of ZFS snapshots under the
+filesystem's
+.Pa .zfs
+directory.
+If
+.Va allow.mount.zfs
+is set, the snapshots may also be mounted.
 .El
 .Pp
 There are pseudo-parameters that are not passed to the kernel, but are