diff --git a/atusb/fw3/usb/atu2.c b/atusb/fw3/usb/atu2.c
index 58cac3f..79923d1 100644
--- a/atusb/fw3/usb/atu2.c
+++ b/atusb/fw3/usb/atu2.c
@@ -13,18 +13,9 @@
 /*
  * Known issues:
  * - no suspend/resume
- * - EP0-sized packets cause an (otherwise harmless) SUEND at the end of the
- *   packet
- * - #ifdef hell
- */
-
-/*
- * This code follows the register read/write sequences from the examples in
- * SiLabs/MCU/Examples/C8051F326_7/USB_Interrupt/Firmware/F326_USB_Main.c and
- * SiLabs/MCU/Examples/C8051F326_7/USB_Interrupt/Firmware/F326_USB_ISR.c
- *
- * More resources:
- * http://www.beyondlogic.org/usbnutshell/usb1.htm
+ * - we don't call back after failed transmissions,
+ * - we don't reset the EP buffer after failed receptions
+ * - enumeration often encounters an error -71 (from which it recovers)
  */
 
 #include <stdint.h>
diff --git a/atusb/fw3/usb/usb.c b/atusb/fw3/usb/usb.c
index d04f51f..f677d03 100644
--- a/atusb/fw3/usb/usb.c
+++ b/atusb/fw3/usb/usb.c
@@ -13,18 +13,7 @@
 /*
  * Known issues:
  * - no suspend/resume
- * - EP0-sized packets cause an (otherwise harmless) SUEND at the end of the
- *   packet
- * - #ifdef hell
- */
-
-/*
- * This code follows the register read/write sequences from the examples in
- * SiLabs/MCU/Examples/C8051F326_7/USB_Interrupt/Firmware/F326_USB_Main.c and
- * SiLabs/MCU/Examples/C8051F326_7/USB_Interrupt/Firmware/F326_USB_ISR.c
- *
- * More resources:
- * http://www.beyondlogic.org/usbnutshell/usb1.htm
+ * - should support EP clearing and stalling
  */
 
 #include <stdint.h>