diff --git a/sys/mips/conf/AR91XX_BASE.hints b/sys/mips/conf/AR91XX_BASE.hints
index 4b5b47f3e73..d6a4911b3c1 100644
--- a/sys/mips/conf/AR91XX_BASE.hints
+++ b/sys/mips/conf/AR91XX_BASE.hints
@@ -32,6 +32,7 @@ hint.arge.1.maddr=0x1a000000
 hint.arge.1.msize=0x1000
 hint.arge.1.irq=3
 
+# XXX The ath device hangs off of the AHB, rather than the Nexus.
 hint.ath.0.at="nexus0"
 hint.ath.0.maddr=0x180c0000
 hint.ath.0.msize=0x30000