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diff --git a/lib/geom/label/glabel.8 b/lib/geom/label/glabel.8
--- a/lib/geom/label/glabel.8
+++ b/lib/geom/label/glabel.8
@@ -172,6 +172,15 @@
and
.Pa /dev/label/bigdiskp1a .
.Pp
+.Nm
+requires write access to a device to create, modify, and destroy
+"automatic" labels. It will fail to persist changes if they are
+applied while file system on the device is currently mounted. To ensure
+that modifications are stored across a reboot, the file system
+needs to be unmounted first. If the device hols the system's root
+file system, entering into single user mode and mounting in read-only
+mode is required to persist the change.
+.Pp
The first argument to
.Nm
indicates an action to be performed:

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