diff --git a/docs/api/file-system-router.md b/docs/api/file-system-router.md
index 964652401f..8e1fbe0fc2 100644
--- a/docs/api/file-system-router.md
+++ b/docs/api/file-system-router.md
@@ -93,6 +93,7 @@ interface Bun {
       style: "nextjs";
       origin?: string;
       assetPrefix?: string;
+      fileExtensions?: string[];
     });
 
     reload(): void;