diff --git a/docs/pdk.ditamap b/docs/pdk.ditamap
index 6a5d911b4..02f8c9c1b 100644
--- a/docs/pdk.ditamap
+++ b/docs/pdk.ditamap
@@ -6,6 +6,7 @@
         <prodname>pdk</prodname>
         <vrmlist>
             <vrm version="3.x"/>
+            <vrm version="2.x"/>
         </vrmlist>
     </prodinfo>
 </topicmeta>