diff --git a/docs/tls.md b/docs/tls.md
index aa70e11c..b7c6b9f9 100644
--- a/docs/tls.md
+++ b/docs/tls.md
@@ -30,7 +30,10 @@ For instance, to use self-signed certificates created with [mkcert](https://gith
     ```diff
     php:
       environment:
-    +    CADDY_SERVER_EXTRA_DIRECTIVES: "tls /etc/caddy/certs/tls.pem /etc/caddy/certs/tls.key"
+    +    CADDY_EXTRA_CONFIG: |
+    +      https:// {
+    +          tls /etc/caddy/certs/tls.pem /etc/caddy/certs/tls.key
+    +      }
         # ...
       volumes:
     +    - ./frankenphp/certs:/etc/caddy/certs:ro