diff --git a/extension.js b/extension.js
index 096c9c2..7f63c88 100644
--- a/extension.js
+++ b/extension.js
@@ -34,7 +34,7 @@ function buildMarkdownItTableOfContentsOptions(configuration) {
 }
 
 function buildIncludeLevelOptionFromConfiguration(configuration) {
-    return Array.from({length: configuration.maximumHeadingLevel}, (v, k) => k + 1);
+    return Array.from({length: configuration.maximumHeadingLevel}, (v, k) => k + 2);
 }
 
 function buildContainerClassOptionFromConfiguration(configuration) {
@@ -57,4 +57,4 @@ function buildMarkerPatternOptionFromConfiguration(configuration) {
 
 function sanitizeHeading(heading) {
     return removeMarkdown(striptags(heading));
-}
\ No newline at end of file
+}