diff --git a/build.xml b/build.xml
index 3cd029608..4a33a3d40 100644
--- a/build.xml
+++ b/build.xml
@@ -1354,6 +1354,7 @@
       <tag name="ant.task" enabled="false" description="Task:" scope="types"/>
       <tag name="ant.datatype" enabled="false" description="Data type:" scope="types"/>
       <tag name="ant.attribute" enabled="false" description="Attribute:" scope="types"/>
+      <tag name="ant.attribute.group" enabled="false" description="Attribute group:" scope="types"/>
       <tag name="ant.element" enabled="false" description="Nested element:" scope="types"/>
       <group title="Apache Ant Core" packages="org.apache.tools.ant*"/>
       <group title="Core Tasks" packages="org.apache.tools.ant.taskdefs*"/>