- * and product _strings_ to actually identify the device. The
- * USB serial number need not be present nor reliable. The HID
- * report content will carry the board's serial number.
+ * and product _strings_ to actually identify the device.
+ *
+ * The USB serial number need not be present nor reliable. The
+ * HID report content will carry the board's serial number.
+ * When users specify "sn=..." connection strings, then run a
+ * regular USB enumation, and filter the result set by serial
+ * numbers which only become available with HID reports.