diff --git a/README.md b/README.md
index 21df204..255e405 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ Run `jumpstart.sh` to download installation media for macOS (internet required).
 ```
 ./jumpstart.sh --mojave
 ```
-> Note: You can skip this if you already have `BaseSystem.img` downloaded. If you have `BaseSystem.dmg`, you will need to convert it with the `dmg2img` tool.
+> Note: You can skip this if you already have `BaseSystem.img` downloaded. If you have `BaseSystem.dmg`, you will need to convert it to a raw image, e.g. `qemu-img convert -O raw BaseSystem.dmg BaseSystem.img`.
 
 ## Step 2
 Create an empty hard disk using `qemu-img`, changing the name and size to preference: