diff --git a/understanding/20/audio-description-or-media-alternative-prerecorded.html b/understanding/20/audio-description-or-media-alternative-prerecorded.html
index 5b0c86ab69..774741afcb 100644
--- a/understanding/20/audio-description-or-media-alternative-prerecorded.html
+++ b/understanding/20/audio-description-or-media-alternative-prerecorded.html
@@ -48,12 +48,14 @@ <h2>Intent of Audio Description or Media Alternative (Prerecorded)</h2>
          more complete representation of the synchronized media content than audio description
          alone.
       </p>
+      <p>
+        The language of the success criterion is an OR statement between the requirement for an <a href="https://www.w3.org/WAI/WCAG21/Understanding/audio-description-or-media-alternative-prerecorded.html">alternative for time-based media</a> OR an audio description. Therefore, if an audio description cannot be provided because there are insufficient spaces in the dialog to insert the Audio Description, then an alternative for time-based media would be required.</p>
       
       <p>If there is any interaction as part of the synchronized media presentation (e.g.,
          "press now to answer the question") then the alternative for time-based media would
          provide hyperlinks or whatever is needed to provide the same functionality.
       </p>
-      
+     
       <div class="note">
          
          <p>