diff --git a/README.md b/README.md
index b11f69c..1490f3c 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,25 @@ go build .
 
 ## Configuración
 
-Editar `config.yml` para configurar el servidor y VeriFactu.
+Editar `config.yml`:
+
+```yaml
+server:
+  port: 6789
+
+verifactu:
+  environment: test
+
+certificates:
+  storage_path: ./certs/
+
+crypto:
+  keys_path: ./keys/
+  name: "VeriFactu API"
+  email: "admin@example.com"
+```
+
+Las claves RSA se generan automáticamente en `./keys/` si no existen.
 
 ---