diff --git a/README.md b/README.md
index 8f58560..d709def 100644
--- a/README.md
+++ b/README.md
@@ -9,3 +9,23 @@ Understand how joins work by interacting and see it visually
 * `cd Visual-JOIN`
 * `npm install`
 * `npm run dev`
+
+
+
+## Adding a new language
+
+To add a new language:
+
+1. Create a file under `src/i18n/locales/` (see `pt.ts` as an example).
+
+2. Implement all required keys from the `Translations` type.
+
+3. Register the locale in `src/i18n/types.ts`:
+
+```ts
+export const SUPPORTED_LOCALES = ['en', 'es', 'fr', 'de', 'sv', 'pt'] as const
+
+export const LOCALES = {
+  ...
+  pt: 'Português',
+}
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