diff --git a/src/epub/content.opf b/src/epub/content.opf
index 879b34b..e1398f8 100644
--- a/src/epub/content.opf
+++ b/src/epub/content.opf
@@ -22,6 +22,7 @@
 		<meta property="schema:accessibilityFeature">alternativeText</meta>
 		<meta property="schema:accessibilityFeature">longDescription</meta>
 		<meta property="schema:accessibilityFeature">readingOrder</meta>
+		<meta property="schema:accessibilityFeature">structuralNavigation</meta>
 		<meta property="schema:accessibilityFeature">tableOfContents</meta>
 		<meta property="schema:accessibilityFeature">unlocked</meta>
 		<meta property="schema:accessibilityHazard">none</meta>