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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -77,6 +77,7 @@ Variation of image attachment:
 3. Run `rails activestorage:install` to create needed directories, migrations, and configuration.
 4. Configure the storage service in `config/environments/*` with `config.active_storage.service = :local`
    that references the services configured in `config/storage_services.yml`.
+5. Optional: Add `gem "mini_magick"` to your Gemfile if you want to use variants.
 
 ## Todos