diff --git a/README.en.md b/README.en.md
index c18d2ff..ab1438a 100644
--- a/README.en.md
+++ b/README.en.md
@@ -59,7 +59,7 @@ services:
 
 - `SITE_NAME`: Your Marreta's name
 - `SITE_DESCRIPTION`: Tell what it's for
-- `SITE_URL`: Where it will run, full address with `https://`
+- `SITE_URL`: Where it will run, full address with `https://`. If you change the port in docker-compose (e.g., 8080:80), you must also include the port in SITE_URL (e.g., https://yoursite:8080)
 - `DNS_SERVERS`: Which DNS servers to use `1.1.1.1, 8.8.8.8`
 - `SELENIUM_HOST`: Selenium host server:PORT (e.g., selenium-hub:4444)
 
diff --git a/README.md b/README.md
index 148076d..6463be9 100644
--- a/README.md
+++ b/README.md
@@ -59,7 +59,7 @@ services:
 
 - `SITE_NAME`: Nome do seu Marreta
 - `SITE_DESCRIPTION`: Conta pra que serve
-- `SITE_URL`: Onde vai rodar, endereço completo com `https://`
+- `SITE_URL`: Onde vai rodar, endereço completo com `https://`. Se você alterar a porta no docker-compose (ex: 8080:80), você também deve incluir a porta no SITE_URL (ex: https://seusite:8080)
 - `DNS_SERVERS`: Quais servidores DNS usar `1.1.1.1, 8.8.8.8`
 - `SELENIUM_HOST`: Servidor:PORTA do host do Selenium (ex: selenium-hub:4444)
 -