diff --git a/README.md b/README.md
index 6a3fb2b..35fe745 100644
--- a/README.md
+++ b/README.md
@@ -105,7 +105,7 @@ adding an entry to `machines/default.nix`. Then copy this repository to the
 target machine and run (`--impure` is needed since `/mnt/nix/store` is not in
 `/nix/store`):
 
-    nixos-install --impure --flake /path/to/repository#hostname
+    nixos-install --no-channel-copy --impure --flake /path/to/repository#hostname
 
 Add the krops sentinel file: