diff --git a/index.html b/index.html
index 055ac8b..e736004 100644
--- a/index.html
+++ b/index.html
@@ -858,6 +858,13 @@ <h3>
           bubble and is not cancelable, at the <a>document</a> associated with
           the <a>selection</a>.
         </p>
+        <p>
+          When an [^input^] or [^textarea^] element provide a text selection and
+          its selection changes (in either extent or [=direction=]), the user
+          agent must [=queue a task=] to [=fire an event=] with the name
+          <code>selectionchange</code>, which does bubble but is not cancelable,
+          at the element.
+        </p>
       </section>
     </section>
     <section id='conformance'>