diff --git a/index.html b/index.html
index 05dbcbd7..c1649c54 100644
--- a/index.html
+++ b/index.html
@@ -4496,6 +4496,9 @@ <h2>Elements</h2>
   the following <a><code>ScrollIntoViewOptions</code></a>:
 
   <dl>
+   <dt>"<code>behavior</code>"
+   <dd>"<code>instant</code>"
+
    <dt><a>Logical scroll position "<code>block</code>"</a>
    <dd>"<code>end</code>"