diff --git a/docs/index.md b/docs/index.md
index 619e64d..0af5b0a 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -20,7 +20,7 @@ This NixOS configuration will start `cardano-node` and related services on the `
 {
   cardano = {
     enable = true;
-    network = preview;
+    network = "preview";
   };
 }
 ```