Update README.md

README.md

@@ -1,15 +1,17 @@
 AzulSCSI Firmware
 =================
 
-Harddrive image files
+Hard Drive & ISO image files
 ---------------------
-AzulSCSI uses the same type of (raw) hard drive image file as in [BlueSCSI instructions](https://github.com/erichelgeson/BlueSCSI/wiki/Usage).
+AzulSCSI uses the same type of (raw) hard drive image file as that of [BlueSCSI instructions](https://github.com/erichelgeson/BlueSCSI/wiki/Usage). 
 
 Examples of valid filenames:
 * `HD5.hda` or `HD5.img`: hard drive with SCSI ID 5
 * `HD20_512.hda`: hard drive with SCSI ID 2, LUN 0, block size 512
 * `CD3.iso`: CD drive with SCSI ID 3
 
+In addition to the simplified filenames style above, the AzulSCSI firmware also looks for images using the BlueSCSI-style "HDxy_512.hda" filename formatting.
+
 Log files and error indications
 -------------------------------
 Log messages are stored in `azullog.txt`, which is cleared on every boot.