diff --git a/sbin/devd/devd.conf.5 b/sbin/devd/devd.conf.5
index 9d3bfadcf32e..d1e74c4492cd 100644
--- a/sbin/devd/devd.conf.5
+++ b/sbin/devd/devd.conf.5
@@ -41,7 +41,7 @@
 .\" ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 .\" SOFTWARE.
 .\"
-.Dd July 20, 2018
+.Dd March 29, 2019
 .Dt DEVD.CONF 5
 .Os
 .Sh NAME
@@ -432,15 +432,19 @@ only includes disk-like devices.
 .It Li CREATE
 A
 .Xr geom 4
-device node is created.
+provider is created.
 .It Li DESTROY
 A
 .Xr geom 4
-device node is destroyed.
+provider is destroyed.
 .It Li GEOM::physpath
 The physical path of a device has changed.
 .It Li MEDIACHANGE
 Physical media has changed.
+.It Li SIZECHANGE
+A
+.Xr geom 4
+provider size has changed.
 .El
 .El
 .Pp
diff --git a/sys/geom/geom_dev.c b/sys/geom/geom_dev.c
index 95126f19a4d3..47cad7d13a09 100644
--- a/sys/geom/geom_dev.c
+++ b/sys/geom/geom_dev.c
@@ -92,6 +92,7 @@ static g_fini_t g_dev_fini;
 static g_taste_t g_dev_taste;
 static g_orphan_t g_dev_orphan;
 static g_attrchanged_t g_dev_attrchanged;
+static g_resize_t g_dev_resize;
 
 static struct g_class g_dev_class	= {
 	.name = "DEV",
@@ -100,7 +101,8 @@ static struct g_class g_dev_class	= {
 	.fini = g_dev_fini,
 	.taste = g_dev_taste,
 	.orphan = g_dev_orphan,
-	.attrchanged = g_dev_attrchanged
+	.attrchanged = g_dev_attrchanged,
+	.resize = g_dev_resize
 };
 
 /*
@@ -302,6 +304,15 @@ g_dev_attrchanged(struct g_consumer *cp, const char *attr)
 	}
 }
 
+static void
+g_dev_resize(struct g_consumer *cp)
+{
+	char buf[SPECNAMELEN + 6];
+
+	snprintf(buf, sizeof(buf), "cdev=%s", cp->provider->name);
+	devctl_notify_f("GEOM", "DEV", "SIZECHANGE", buf, M_WAITOK);
+}
+
 struct g_provider *
 g_dev_getprovider(struct cdev *dev)
 {