diff --git a/README.md b/README.md
index 85c27c3..af82c9e 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ For each machine, there is a top-level directory, e.g. [yodaTab](yodaTab).
 
 * https://nixos.wiki/wiki/Nixos-rebuild
 
-Directly change to new config, make it default:
+Directly change to new config and make it default:
 
 ```shell
 sudo nixos-rebuild -I nixos-config=yodaTab/configuration.nix switch
@@ -34,10 +34,18 @@ Then run `nixos-rebuild switch`, see above.
 ## Garbage Collection
 
 * https://nixos.org/manual/nix/stable/package-management/garbage-collection.html
+* https://discourse.nixos.org/t/why-doesnt-nix-collect-garbage-remove-old-generations-from-efi-menu/17592/4
+
+For all profiles:
 
 ```shell
-nix-env --delete-generations 14d
-nix-store --gc
+sudo nix-collect-garbage --delete-older-than 14d
+```
+
+Remove old generations from EFI:
+
+```shell
+sudo /run/current-system/bin/switch-to-configuration boot
 ```
 
 ## Install Home Manager with niv