diff --git a/config/alfresco/model/wcmModel.xml b/config/alfresco/model/wcmModel.xml
index 8234bdc24c..1333c3081a 100644
--- a/config/alfresco/model/wcmModel.xml
+++ b/config/alfresco/model/wcmModel.xml
@@ -101,6 +101,11 @@
                <type>d:text</type>
                <mandatory>true</mandatory>
             </property>
+            <property name="wcm:templateoutputmethodderivedfileextension">
+               <title>Type</title>
+               <type>d:text</type>
+               <mandatory>true</mandatory>
+            </property>
             <property name="wcm:templatesource">
                <title>Template Source</title>
                <type>d:noderef</type>
diff --git a/source/java/org/alfresco/model/WCMModel.java b/source/java/org/alfresco/model/WCMModel.java
index 03388be71a..c4c26bd617 100644
--- a/source/java/org/alfresco/model/WCMModel.java
+++ b/source/java/org/alfresco/model/WCMModel.java
@@ -32,5 +32,6 @@ public interface WCMModel
     // An XML to something else tranformer aspect.
     public static final QName ASPECT_TEMPLATE_OUTPUT_METHOD = QName.createQName(NamespaceService.WCM_MODEL_1_0_URI, "templateoutputmethod");
     public static final QName PROP_TEMPLATE_OUTPUT_METHOD_TYPE = QName.createQName(NamespaceService.WCM_MODEL_1_0_URI, "templateoutputmethodtype");
+    public static final QName PROP_TEMPLATE_OUTPUT_METHOD_DERIVED_FILE_EXTENSION = QName.createQName(NamespaceService.WCM_MODEL_1_0_URI, "templateoutputmethodderivedfileextension");
     public static final QName PROP_TEMPLATE_SOURCE = QName.createQName(NamespaceService.WCM_MODEL_1_0_URI, "templatesource");
 }