diff --git a/README.md b/README.md
index a041dd7..f28bc5a 100644
--- a/README.md
+++ b/README.md
@@ -145,6 +145,8 @@ An alternative lightweight approach is to simply change the default `~/.emacs.d`
 (setq user-emacs-directory minimal-emacs-var-dir)
 ```
 
+IMPORTANT: The code above should be added to `~/.emacs.d/pre-early-init.el`, not the other files, as it modifies the behavior of all subsequent init files.
+
 ### How to prevent minimal-emacs.d from saving custom.el?
 
 To prevent Emacs from saving customization information to a custom file, set `custom-file` to `null-device` by adding to the following to `~/.emacs.d/post-init.el`: