diff --git a/README.md b/README.md
index e700e5c5f8..4bcf8dc0a4 100644
--- a/README.md
+++ b/README.md
@@ -214,6 +214,14 @@ configuration:
 - Add trusted binstubs to the `PATH`.
 - Load the ASDF version manager.
 
+[Rails](https://rubyonrails.org)
+
+- Adds [railsrc][] with `--database=postgresql`. If you need to use another
+  database, you can override this value like so: `rails new my_app --database=mysql` or
+`rails new my_app --no_rc`
+
+[railsrc]: https://github.com/rails/rails/blob/7f7f9df8641e35a076fe26bd097f6a1b22cb4e2d/railties/lib/rails/generators/rails/app/USAGE#L5C1-L7
+
 Shell aliases and scripts:
 
 - `b` for `bundle`.
diff --git a/railsrc b/railsrc
new file mode 100644
index 0000000000..9a34b2e6dd
--- /dev/null
+++ b/railsrc
@@ -0,0 +1 @@
+--database=postgresql