diff --git a/sys/sys/bus.h b/sys/sys/bus.h
index db6d3cf39b2..152b067ada0 100644
--- a/sys/sys/bus.h
+++ b/sys/sys/bus.h
@@ -178,11 +178,8 @@ typedef void driver_intr_t(void*);
  * spls implicit in names like INTR_TYPE_TTY. In the meantime, don't
  * confuse things by renaming them (Grog, 18 July 2000).
  *
- * We define this in terms of bits because some devices may belong
- * to multiple classes (and therefore need to be included in
- * multiple interrupt masks, which is what this really serves to
- * indicate. Buses which do interrupt remapping will want to
- * change their type to reflect what sort of devices are underneath.
+ * Buses which do interrupt remapping will want to change their type
+ * to reflect what sort of devices are underneath.
  */
 enum intr_type {
 	INTR_TYPE_TTY = 1,