diff --git a/projects/scully-plugin-toc/src/lib/interfaces.ts b/projects/scully-plugin-toc/src/lib/interfaces.ts
index ffb1c76..7176a89 100644
--- a/projects/scully-plugin-toc/src/lib/interfaces.ts
+++ b/projects/scully-plugin-toc/src/lib/interfaces.ts
@@ -1,7 +1,7 @@
 export type Level = 'h1' | 'h2' | 'h3' | 'h4' | 'h5' | 'h6';
 
 export interface TocConfig {
-  blogAreaSelector: string;
-  insertSelector: string;
-  level: Level[];
+  blogAreaSelector?: string;
+  insertSelector?: string;
+  level?: Level[];
 }