diff --git a/ortc.html b/ortc.html
index ebb189f..69de3e8 100644
--- a/ortc.html
+++ b/ortc.html
@@ -4193,7 +4193,7 @@ <h3>RTP header extensions</h3>
                         </tr>
                     </thead>
                     <tbody>
-                            <tr id="def-transmission-time-offset*">
+                        <tr id="def-transmission-time-offset*">
                             <td><dfn>Transmission Time Offset</dfn></td>
                             <td>
                                 [[RFC5450]]
@@ -4236,6 +4236,16 @@ <h3>RTP header extensions</h3>
                                 This extension indicates the audio level of individual conference participants.
                             </td>
                         </tr>
+                        <tr id="def-abs-send-time*">
+                            <td><dfn>Absolute Send Time</dfn></td>
+                            <td>
+                                [[ABS-SEND-TIME]]
+                            </td>
+                            <td>None</td>
+                            <td>
+                                This extension indicates the absolute send time.
+                            </td>
+                        </tr>
                         <tr id="def-cvo*">
                             <td><dfn>CVO</dfn></td>
                             <td>