diff --git a/index.html b/index.html
index 215a920..7dc0497 100644
--- a/index.html
+++ b/index.html
@@ -456,7 +456,9 @@ button.sidebar-toggle{
๐ level2: explicit links
-๐ level3: 3D timeline
+๐ level3: Media Fragments
+
+๐ level4: URI scheme
๐ XR fragments
@@ -472,7 +474,7 @@ button.sidebar-toggle{
๐งช experimental
-๐งช level4: non-normative metadata
+๐งช levelX: non-normative metadata
๐งฐ <model-viewer>
@@ -982,9 +984,9 @@ button.sidebar-toggle{