diff --git a/README.md b/README.md
index cc17424..8623a3b 100644
--- a/README.md
+++ b/README.md
@@ -23,5 +23,5 @@
 3. Add crontab entry:
 
    ```
-   */5 * * * * docker exec -u www-data cloud_app_1 php cron.php
+   */5 * * * * /snap/bin/docker exec -u www-data cloud_app_1 php cron.php
    ```
diff --git a/env.example b/env.example
index 8b06523..1155a76 100644
--- a/env.example
+++ b/env.example
@@ -5,3 +5,4 @@ FQDN_HOME=www.example.net
 FQDN_BLOG=blog.example.net
 DOMAIN_NAME=example.net
 TRUSTED_PROXIES=192.168.254.0/20
+REAL_EXTERNAL_IP=192.168.1.1