diff --git a/xep-0167.xml b/xep-0167.xml
index 290299b9..de6115cb 100644
--- a/xep-0167.xml
+++ b/xep-0167.xml
@@ -132,36 +132,43 @@
     <tr>
       <th>Attribute</th>
       <th>Description</th>
+      <th>Datatype</th>
       <th>Inclusion</th>
     </tr>
     <tr>
       <td>channels</td>
       <td>The number of channels; if omitted, it MUST be assumed to contain one channel</td>
+      <td>positiveInteger (defaults to 1)</td>
       <td>RECOMMENDED</td>
     </tr>
     <tr>
       <td>clockrate</td>
       <td>The sampling frequency in Hertz</td>
+      <td>positiveInteger</td>
       <td>RECOMMENDED</td>
     </tr>
     <tr>
       <td>id</td>
       <td>The payload identifier</td>
+      <td>positiveInteger</td>
       <td>REQUIRED</td>
     </tr>
     <tr>
       <td>maxptime</td>
       <td>Maximum packet time as specified in RFC 4566</td>
+      <td>positiveInteger</td>
       <td>OPTIONAL</td>
     </tr>
     <tr>
       <td>name</td>
       <td>The appropriate subtype of the audio MIME type</td>
+      <td>string</td>
       <td>RECOMMENDED for static payload types, REQUIRED for dynamic payload types</td>
     </tr>
     <tr>
       <td>ptime</td>
       <td>Packet time as specified in RFC 4566</td>
+      <td>positiveInteger</td>
       <td>OPTIONAL</td>
     </tr>
   </table>