jaxb - How to bind xsd to Java classes with element documentation? -

i have xml schema want bind java classes xjc. in xsd have fragments like:

<xs:element name="author" type="author">   <xs:annotation>     <xs:documentation>       author of book.     </xs:documentation>   </xs:annotation> </xs:element> 

but documentation lost in java bindings. how can "the author of book." fragment java code?