diff --git a/sys/dev/etherswitch/arswitch/arswitch_7240.c b/sys/dev/etherswitch/arswitch/arswitch_7240.c
index 3d2543a7017f..01ea9b3e9c1b 100644
--- a/sys/dev/etherswitch/arswitch/arswitch_7240.c
+++ b/sys/dev/etherswitch/arswitch/arswitch_7240.c
@@ -97,6 +97,8 @@ ar7240_hw_global_setup(struct arswitch_softc *sc)
 	    AR7240_GLOBAL_CTRL_MTU_MASK,
 	    SM(1536, AR7240_GLOBAL_CTRL_MTU_MASK));
 
+	/* XXX ARP? Frame Age enable? */
+
 	/* Service Tag */
 	arswitch_modifyreg(sc->sc_dev, AR8X16_REG_SERVICE_TAG,
 	    AR8X16_SERVICE_TAG_MASK, 0);
diff --git a/sys/dev/etherswitch/arswitch/arswitch_8316.c b/sys/dev/etherswitch/arswitch/arswitch_8316.c
index d646e182f80c..54d6618bd805 100644
--- a/sys/dev/etherswitch/arswitch/arswitch_8316.c
+++ b/sys/dev/etherswitch/arswitch/arswitch_8316.c
@@ -137,6 +137,7 @@ ar8316_hw_global_setup(struct arswitch_softc *sc)
 	arswitch_writereg(sc->sc_dev, AR8X16_REG_TAG_PRIO, 0xfa50);
 
 	/* Enable ARP frame acknowledge. */
+	/* XXX TODO: aging? */
 	arswitch_modifyreg(sc->sc_dev, AR8X16_REG_AT_CTRL, 0,
 	    AR8X16_AT_CTRL_ARP_EN);