diff --git a/src/templates/Doc.jsx b/src/templates/Doc.jsx
index 9e0310eb..a72ef85c 100644
--- a/src/templates/Doc.jsx
+++ b/src/templates/Doc.jsx
@@ -124,7 +124,7 @@ export const pageQuery = graphql`
     query DocBySlug($slug: String!) {
         markdownRemark(fields: { slug: { eq: $slug } }) {
             id
-            tableOfContents
+            tableOfContents(maxDepth: 3)
             html
             htmlAst
             frontmatter {