diff --git a/maven-plugin-plugin/src/main/mdo/pluginRequirements.mdo b/maven-plugin-plugin/src/main/mdo/pluginRequirements.mdo
index 8db2d12..c76ebeb 100644
--- a/maven-plugin-plugin/src/main/mdo/pluginRequirements.mdo
+++ b/maven-plugin-plugin/src/main/mdo/pluginRequirements.mdo
@@ -19,7 +19,8 @@ specific language governing permissions and limitations
 under the License.
 -->
 
-<model>
+<model xmlns="http://modello.codehaus.org/MODELLO/1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+       xsi:schemaLocation="http://modello.codehaus.org/MODELLO/1.0.0 http://modello.codehaus.org/xsd/modello-1.0.0.xsd">
   <id>pluginRequirements</id>
   <name>PluginRequirements</name>
   <description><![CDATA[Model to specify plugin requirements.]]></description>