diff --git a/README.md b/README.md
index 91b0c3d..a79efba 100644
--- a/README.md
+++ b/README.md
@@ -36,12 +36,20 @@ const i18nOptions = {
 const i18n = new I18n(i18nOptions)
 ```
 
-... later
+... then in your app
 
 ```jsx
 <label>{i18n.get('addOption')}</label>
 ```
 
+### Add a Language after initialization
+
+```javascript
+i18n.addLanguage('fr-FR', {
+  addOption: 'Ajouter une option',
+})
+```
+
 ### Example `.lang` file
 
 ```txt