diff --git a/source b/source
index ac8a64077f8..1848f28ff2b 100644
--- a/source
+++ b/source
@@ -96875,6 +96875,9 @@ enum <dfn enum>DOMParserSupportedType</dfn> {
      <li><p>If <var>repeat</var> is true, then perform the <span>timer initialization
      steps</span> again, given <var>global</var>, <var>handler</var>, <var>timeout</var>,
      <var>arguments</var>, true, and <var>id</var>.</p></li>
+
+     <li><p>Otherwise, <span data-x="map remove">remove</span> <var>global</var>'s <span>map of
+     active timers</span>[<var>id</var>].</p></li>
     </ol>
    </li>
 
@@ -96886,16 +96889,9 @@ enum <dfn enum>DOMParserSupportedType</dfn> {
    task">queues a global task</span> on the <dfn export>timer task source</dfn> given
    <var>global</var> to run <var>task</var>.</p></li>
 
-   <li>
-    <p><span>Run steps after a timeout</span> given <var>global</var>, "<code
-    data-x="">setTimeout/setInterval</code>", <var>timeout</var>, <var>completionStep</var>, and
-    <var>id</var>.</p>
-
-    <p class="note">Once the task has been processed, if <var>repeat</var> is false, it is safe to
-    remove the entry for <var>id</var> from the <span>map of active timers</span> (there is no way
-    for the entry's existence to be detected past this point, so it does not technically matter one
-    way or the other).</p>
-   </li>
+   <li><p><span>Run steps after a timeout</span> given <var>global</var>, "<code
+   data-x="">setTimeout/setInterval</code>", <var>timeout</var>, <var>completionStep</var>, and
+   <var>id</var>.</p></li>
 
    <li><p>Return <var>id</var>.</p></li>
   </ol>
@@ -96996,6 +96992,9 @@ scheduleWork(); // queues a task to do lots of work</code></pre>
      </li>
 
      <li><p>Perform <var>completionSteps</var>.</p></li>
+
+     <li><p>If <var>timerKey</var> is a non-numeric value, <span data-x="map remove">remove</span>
+     <var>global</var>'s <span>map of active timers</span>[<var>timerKey</var>].</p></li>
     </ol>
    </li>
   </ol>