Update ruby-on-rails.mdx

apps/docs/pages/guides/getting-started/quickstarts/ruby-on-rails.mdx

@@ -36,6 +36,8 @@ export const meta = {
 
     When your project is up and running, navigate to the [database settings](https://supabase.com/dashboard/project/_/settings/database) to find the URI connection string.
 
+    In this quickstart, we are going to connect via the connection pooler. If your network supports IPv6, you can connect to the database directly without using the connection pooler.
+
     Rails ships with a Postgres adapter included, you can simply configure it via the environment variables. You can find the database URL in your [Supabase Dashboard](/dashboard/project/_/settings/database).
 
     </StepHikeCompact.Details>