diff --git a/docs/src/content/docs/configuration/authentication.mdx b/docs/src/content/docs/configuration/authentication.mdx
index a8001ca..73048cb 100644
--- a/docs/src/content/docs/configuration/authentication.mdx
+++ b/docs/src/content/docs/configuration/authentication.mdx
@@ -4,7 +4,7 @@ import { Callout } from "nextra/components";
 
 Some registries (or specific images) may require you to be authenticated. For those, you can modify `cup.json` like this:
 
-```json
+```jsonc
 {
   "registries": {
     "<YOUR_REGISTRY_DOMAIN_1>": {