diff --git a/source/src/pages/Page.tsx b/source/src/pages/Page.tsx
index 95b33be..ef61c14 100644
--- a/source/src/pages/Page.tsx
+++ b/source/src/pages/Page.tsx
@@ -104,11 +104,11 @@ const StyledMetaContainer = styled.div`
 		})};
 `
 
-function parseToc(json: TocElement[]) {
+function parseToc(tocData: TocElement[]) {
 	return (
 		<ol>
-			{json.map((elem) => (
-				// elem: content, i, lvl
+			{tocData.map((elem) => (
+				// use elem.lvl
 				<li key={elem.slug}>
 					<HashLink smooth to={location.pathname + "#" + elem.slug}>
 						{elem.content}
diff --git a/source/src/types/typings.d.ts b/source/src/types/typings.d.ts
index 1736c45..2b4debc 100644
--- a/source/src/types/typings.d.ts
+++ b/source/src/types/typings.d.ts
@@ -1,6 +1,8 @@
 export interface TocElement {
 	slug: string
 	content: string
+	i: number
+	lvl: number
 }
 
 export interface Post {