diff --git a/README.md b/README.md
index e89685ac..949f6b2f 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,10 @@ This repo is managed with Nix + GNU stow
   nixos-generate-config --no-filesystems --root /mnt --dir . # disko will take care of the file system configuration
   # put the generated config in the right path and import it
 
-  nixos-install --flake .dotfiles#<hostname>
+  # We do -j 1 because otherwise the kernel or the fonts might use too much
+  # memory at the same time and the system will kaput
+  nixos-install --flake .dotfiles#<hostname> -j 1
+
   # profit
   ```