diff --git a/understanding/20/audio-description-or-media-alternative-prerecorded.html b/understanding/20/audio-description-or-media-alternative-prerecorded.html
index d35ec49256..cb82e736c4 100644
--- a/understanding/20/audio-description-or-media-alternative-prerecorded.html
+++ b/understanding/20/audio-description-or-media-alternative-prerecorded.html
@@ -147,6 +147,10 @@ <h2>Resources for Audio Description or Media Alternative (Prerecorded)</h2>
       
       
       <ul>
+         <li>
+
+            <a href="https://www.w3.org/WAI/media/av/">Making Audio and Video Media Accessible, W3C Web Accessibility Initiative (WAI)</a>
+         </li>
          
          <li>
             								       
diff --git a/understanding/20/audio-description-prerecorded.html b/understanding/20/audio-description-prerecorded.html
index 0c2d99af2a..d82ceca1d5 100644
--- a/understanding/20/audio-description-prerecorded.html
+++ b/understanding/20/audio-description-prerecorded.html
@@ -116,6 +116,11 @@ <h2>Resources for Audio Description (Prerecorded)</h2>
       
       <ul>
          
+         <li>
+
+            <a href="https://www.w3.org/WAI/media/av/description/">Description of Visual Information</a>, in <a href="https://www.w3.org/WAI/media/av/">Making Audio and Video Media Accessible</a>, W3C Web Accessibility Initiative (WAI)
+         </li>
+         
          <li>
             								       
             <a href="http://ncam.wgbh.org/invent_build/web_multimedia/accessible-digital-media-guide/guideline-h-multimedia#techH12">NCAM Rich Media Accessibility, Accessible SMIL Templates</a>
diff --git a/understanding/20/audio-only-and-video-only-prerecorded.html b/understanding/20/audio-only-and-video-only-prerecorded.html
index dd47f92fb2..aaf0b22504 100644
--- a/understanding/20/audio-only-and-video-only-prerecorded.html
+++ b/understanding/20/audio-only-and-video-only-prerecorded.html
@@ -116,6 +116,12 @@ <h2>Resources for Audio-only and Video-only (Prerecorded)</h2>
       
       
       <ul>
+
+         <li>
+
+            <a href="https://www.w3.org/WAI/media/av/">Making Audio and Video Media Accessible, W3C Web Accessibility Initiative (WAI)</a>
+         </li>
+         
          
          <li>
             	
diff --git a/understanding/20/captions-prerecorded.html b/understanding/20/captions-prerecorded.html
index 8c48c0292b..eeb7488959 100644
--- a/understanding/20/captions-prerecorded.html
+++ b/understanding/20/captions-prerecorded.html
@@ -111,6 +111,10 @@ <h2>Resources for Captions (Prerecorded)</h2>
          <h3>Guides to Captioning</h3>
          
          <ul>
+
+            <li>
+                           <a href="https://www.w3.org/WAI/media/av/captions/">Captions/Subtitles</a>, in <a href="https://www.w3.org/WAI/media/av/">Making Audio and Video Media Accessible</a>, W3C Web Accessibility Initiative (WAI)
+            </li>
             
             <li>
                <a href="https://www.bbc.co.uk/accessibility/forproducts/guides/subtitles/">BBC: Subtitle Guidelines</a>
diff --git a/understanding/20/media-alternative-prerecorded.html b/understanding/20/media-alternative-prerecorded.html
index 16a1fc3b4d..4a748e8f59 100644
--- a/understanding/20/media-alternative-prerecorded.html
+++ b/understanding/20/media-alternative-prerecorded.html
@@ -108,7 +108,13 @@ <h2>Resources for Media Alternative (Prerecorded)</h2>
       
       
       <ul>
-         
+
+         <li>
+
+            <a href="https://www.w3.org/WAI/media/av/transcripts/">Transcripts</a>, in <a href="https://www.w3.org/WAI/media/av/">Making Audio and Video Media Accessible</a>, W3C Web Accessibility Initiative (WAI)
+
+         </li>
+
          <li>
             								       
             <a href="http://www.uiaccess.com/transcripts/transcript_services.html">uiAccess list of transcription services</a>
diff --git a/understanding/20/sign-language-prerecorded.html b/understanding/20/sign-language-prerecorded.html
index 6b2d8f9b87..0939c00928 100644
--- a/understanding/20/sign-language-prerecorded.html
+++ b/understanding/20/sign-language-prerecorded.html
@@ -85,6 +85,12 @@ <h2>Resources for Sign Language (Prerecorded)</h2>
       
       <ul>
          
+         <li>
+
+            <a href="https://www.w3.org/WAI/media/av/sign-languages/">Sign Languages</a>, in <a href="https://www.w3.org/WAI/media/av/">Making Audio and Video Media Accessible</a>, W3C Web Accessibility Initiative (WAI)
+
+         </li>
+         
          <li>
             								       
             <a href="https://www.w3.org/TR/REC-smil/">Synchronized Multimedia Integration Language (SMIL) 1.0</a>
diff --git a/understanding/20/time-based-media.html b/understanding/20/time-based-media.html
index 7da569c326..1f00799354 100644
--- a/understanding/20/time-based-media.html
+++ b/understanding/20/time-based-media.html
@@ -14,7 +14,7 @@ <h2>Intent of Time-Based Media</h2>
       
       
       <p>The purpose of this guideline is to provide access to time-based and synchronized
-         media.This includes media that is:
+         media. This includes media that is:
       </p>
       
       <ul>
@@ -36,9 +36,7 @@ <h2>Intent of Time-Based Media</h2>
       
       <p>For 
          <strong>audio-only</strong> or 
-         <strong>video-only</strong> media, you only need to apply the success criteria that say "
-         <strong>audio-only</strong>" or "
-         <strong>video-only</strong>" in their short name. If your media is not 
+         <strong>video-only</strong> media, you only need to apply the success criteria that say "<strong>audio-only</strong>" or "<strong>video-only</strong>" in their short name. If your media is not 
          <strong>audio-only</strong> or 
          <strong>video-only</strong>, then all the rest of the success criteria apply.
       </p>