--- a/schema.org/ext/tvradio.html	Thu Oct 03 18:12:38 2013 +0200
+++ b/schema.org/ext/tvradio.html	Fri Oct 11 15:31:50 2013 +0100
@@ -372,8 +372,13 @@
       <span>Range: <a property="http://schema.org/range" href="http://schema.org/Number">Number</a></span>
     </div>
 
-
-
+    <!-- numberOfSeasons -->
+    <div typeof="rdf:Property" resource="http://schema.org/numberOfSeasons">
+      <span class="h" property="rdfs:label">numberOfSeasons</span>
+      <span property="rdfs:comment">The number of seasons in this series.</span>
+      <span>Domain: <a property="http://schema.org/domain" href="http://schema.org/Series">Series</a></span>
+      <span>Range: <a property="http://schema.org/range" href="http://schema.org/Number">Number</a></span>
+    </div>
 
     <!-- episode / episodes -->
     <div typeof="rdf:Property" resource="http://schema.org/episode">