diff --git a/2025/Secure erase under macOS + reinstall.md b/2025/Secure erase under macOS + reinstall.md
index 4e2ca2f..a0cd733 100644
--- a/2025/Secure erase under macOS + reinstall.md	
+++ b/2025/Secure erase under macOS + reinstall.md	
@@ -24,6 +24,14 @@ From this [post at Backblaze](https://www.backblaze.com/blog/how-to-wipe-a-mac-
 
 Source: <https://apple.stackexchange.com/a/405605>
 
+## Notes for wipe
+
+* Create macOS install/boot USB see ...
+* Boot with alt-key into USB
+* Go to menubar -> Utilities -> Terminal
+* List disks with `diskutil list`
+* Unmount disk `diskutil unmountDisk /dev/disk0`
+* Secure erase disk `diskutil secureErase 2 /dev/disk0`
 ## Extra for reinstall clean old version
 
 * https://www.macworld.com/article/671911/how-to-get-old-macos-download-big-sur-catalina-mojave-and-more.html