diff --git a/Stateless-Mode.md b/Stateless-Mode.md
index a5331b7..600b9f1 100644
--- a/Stateless-Mode.md
+++ b/Stateless-Mode.md
@@ -32,7 +32,7 @@ Configure your webserver to respond statelessly to challenges for a given accoun
     ```
     ### CADDY
     Add something similar to your `Caddyfile`:
-    ```
+    ```Caddyfile
     example.com {
       @achallenge {
         path_regexp ch ^/\.well-known/acme-challenge/([-_a-zA-Z0-9]+)$