diff --git a/curriculum/challenges/english/blocks/lab-html-audio-and-video-player/68de40f53fcaf106f51cc20f.md b/curriculum/challenges/english/blocks/lab-html-audio-and-video-player/68de40f53fcaf106f51cc20f.md
index ea966be06b1..d9c8388b2d5 100644
--- a/curriculum/challenges/english/blocks/lab-html-audio-and-video-player/68de40f53fcaf106f51cc20f.md
+++ b/curriculum/challenges/english/blocks/lab-html-audio-and-video-player/68de40f53fcaf106f51cc20f.md
@@ -112,6 +112,25 @@ const typeAttr = source.getAttribute('type');
 assert.isNotEmpty(typeAttr);
 ```
 
+The `type` attribute should match the media type of the file extension of the `src` attribute.
+
+```js
+const section = document.querySelector('section');
+const source = section?.querySelector('h2 + video > source');
+const typeAttr = source.getAttribute('type');
+const srcAttr = source.getAttribute('src');
+const srcFileExt = srcAttr.match(/[^\.]+$/g)[0];
+const fileExtToMediaTypes = {
+  mp4: ['video/mp4'],
+  webm: ['video/webm'],
+  ogg: ['video/ogg'],
+  avi: ['video/avi', 'video/vnd.avi', 'video/msvideo', 'video/x-msvideo'],
+  mov: ['video/quicktime']
+};
+const srcMediaTypes = fileExtToMediaTypes[srcFileExt];
+assert.oneOf(typeAttr, srcMediaTypes);
+```
+
 Inside the second `section` element, you should have an `h2` element for the title of the song playing.
 
 ```js