diff --git a/README.md b/README.md
index 50d40ee..a767dec 100644
--- a/README.md
+++ b/README.md
@@ -155,6 +155,11 @@ osascript -e 'tell application "Finder" to eject (every disk whose ejectable is
 hdiutil attach /path/to/diskimage.dmg
 ```
 
+#### Unmount Disk Image
+```bash
+hdiutil detach /dev/disk2s1
+```
+
 #### Repair File Permissions
 You don't have to use the Disk Utility GUI for this.
 ```bash