diff --git a/README.md b/README.md
index 4fe7213..b2d77ad 100644
--- a/README.md
+++ b/README.md
@@ -59,3 +59,10 @@ just --list
 * `gpg2 --edit-card; fetch`
 * clone password-manager and infra repositories
 * gpg2: ultimately trust my own key
+
+## Swapping out a disk
+
+1. offline-bitwise copy of drive
+2. disconnect remove the previous drive
+3. replace the driveId in the device's hw.nix
+4. run the `just disk-relabel nix/os/devices/<deviceName> <prevDiskId>` command to rename the filesystem and volume group