diff --git a/source b/source
index ce00c5b4e9b..b7497f664af 100644
--- a/source
+++ b/source
@@ -66769,9 +66769,13 @@ interface <dfn interface>OffscreenCanvas</dfn> : <span>EventTarget</span> {
   attribute <span>EventHandler</span> <span data-x="handler-offscreencanvas-oncontextrestored">oncontextrestored</span>;
 };</code></pre>
 
-  <p class="note"><code>OffscreenCanvas</code> is an <code>EventTarget</code> so that WebGL can
-  fire <code data-x="">webglcontextlost</code> and <code data-x="">webglcontextrestored</code>
-  events at it. <ref spec=WEBGL></p>
+  <p class="note"><code>OffscreenCanvas</code> is an <code>EventTarget</code>, so both
+  <code>OffscreenCanvasRenderingContext2D</code> and WebGL can fire events at it.
+  <code>OffscreenCanvasRenderingContext2D</code> can fire <code
+  data-x="event-contextlost">contextlost</code> and <code
+  data-x="event-contextrestored">contextrestored</code>, and WebGL can fire <code
+  data-x="">webglcontextlost</code> and <code data-x="">webglcontextrestored</code>. <ref
+  spec=WEBGL></p>
 
   <p><code>OffscreenCanvas</code> objects are used to create rendering contexts, much like an
   <code>HTMLCanvasElement</code>, but with no connection to the DOM. This makes it possible to