diff --git a/index.html b/index.html
index 3dd28a0..7856766 100644
--- a/index.html
+++ b/index.html
@@ -966,6 +966,10 @@ <h4><dfn>Deactivate an EditContext</dfn></h4>
         <li>If |editContext|'s [=is composing=] is true, then:
             <ol>
                 <li>Set |editContext|'s [=is composing=] to false.</li>
+                <li>
+                    [=Fire an event=] named "textformatupdate" at |editContext| using {{TextFormatUpdateEvent}} with
+                    the {{TextFormatUpdateEvent}}'s [=text format list=] initialized to an empty list.
+                </li>
                 <li>
                     [=Fire an event=] named
                     <a href="https://w3c.github.io/uievents/#event-type-compositionend">compositionend</a>