diff --git a/sys/mips/atheros/if_arge.c b/sys/mips/atheros/if_arge.c
index be38167ebf57..6a22f3f23e7f 100644
--- a/sys/mips/atheros/if_arge.c
+++ b/sys/mips/atheros/if_arge.c
@@ -885,6 +885,11 @@ arge_attach(device_t dev)
 	/*
 	 * Don't do this for the MDIO bus case - it's already done
 	 * as part of the MDIO bus attachment.
+	 *
+	 * XXX TODO: if we don't do this, we don't ever release the MAC
+	 * from reset and we can't use the port.  Now, if we define ARGE_MDIO
+	 * but we /don't/ define two MDIO busses, then we can't actually
+	 * use both MACs.
 	 */
 #if !defined(ARGE_MDIO)
 	/* Initialize the MAC block */