diff --git a/caddy/frankenphp/Caddyfile b/caddy/frankenphp/Caddyfile
index 43ed21b..62c9b17 100644
--- a/caddy/frankenphp/Caddyfile
+++ b/caddy/frankenphp/Caddyfile
@@ -1,6 +1,6 @@
 {
 	# Debug
-    {$DEBUG}
+    {$CADDY_DEBUG}
 
 	frankenphp {
 		#worker /path/to/your/worker.php
diff --git a/docs/config.md b/docs/config.md
index ba46b52..4c9af68 100644
--- a/docs/config.md
+++ b/docs/config.md
@@ -10,11 +10,11 @@ In the Docker image, the `php.ini` file is located at `/usr/local/lib/php.ini`.
 
 ## Enable the Debug Mode
 
-When using the Docker image, set the `DEBUG` environment variable to `debug` to enable the debug mode:
+When using the Docker image, set the `CADDY_DEBUG` environment variable to `debug` to enable the debug mode:
 
 ```
 docker run -v $PWD:/app/public \
-    -e DEBUG=debug \
+    -e CADDY_DEBUG=debug \
     -p 80:80 -p 443:443 \
     dunglas/frankenphp
 ```