a couple of small ommissions corrected

README.md

@@ -271,6 +271,8 @@ Other Linux Guests
 
 ### BSD Guest Support
 
+`quickget` also supports:
+
 -   `freebsd` (FreeBSD)
 -   `openbsd` (OpenBSD)
 
@@ -286,6 +288,19 @@ disk_img="debian-bullseye/disk.qcow2"
 iso="debian-bullseye/firmware-11.0.0-amd64-DVD-1.iso"
 ```
 
+If you already have a collection of ISOs downloaded you can have
+`quickget` find and copy your existing file into the VM directory.
+
+``` {.text}
+--isodir                : base path beneath which to find local ISO copy
+                                       if a matching file is found it will be copied to the VM directory
+--localiso              : optional local ISO filename - defaults to target filename
+```
+
+`quickget` will then continue to `wget` or `zsync` using that file as a
+prior copy. If the target file exists in the VM directory `quickget`
+will raise an error if you run it with `--isodir`
+
 -   Use `quickemu` to start the virtual machine:
 
 ``` {.bash}