Index: sys/dev/acpica/acpi.c
===================================================================
--- sys/dev/acpica/acpi.c
+++ sys/dev/acpica/acpi.c
@@ -573,7 +573,8 @@
     sysctl_ctx_init(&sc->acpi_sysctl_ctx);
     sc->acpi_sysctl_tree = SYSCTL_ADD_NODE(&sc->acpi_sysctl_ctx,
         SYSCTL_STATIC_CHILDREN(_hw), OID_AUTO, device_get_name(dev),
-	CTLFLAG_RD | CTLFLAG_MPSAFE, 0, "");
+	CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
+	"Advanced Configuration and Power Management");
     SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
 	OID_AUTO, "supported_sleep_state",
 	CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
Index: sys/dev/acpica/acpi_acad.c
===================================================================
--- sys/dev/acpica/acpi_acad.c
+++ sys/dev/acpica/acpi_acad.c
@@ -174,7 +174,7 @@
 	SYSCTL_ADD_PROC(&acpi_sc->acpi_sysctl_ctx,
 	    SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree), OID_AUTO, "acline",
 	    CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, dev, 0,
-	    acpi_acad_sysctl, "I", "");
+	    acpi_acad_sysctl, "I", "AC line state");
     }
 
     /* Get initial status after whole system is up. */