--- a/README.adoc
+++ b/README.adoc
@@ -14,6 +14,8 @@
 
 == Flake example
 
+[source,nix]
+----
 {
   description = "My cluster configuration";
   inputs = {
@@ -106,6 +108,7 @@
     };
   };
 }
+----
 
 == Secret generator example