--- modules/damieng/clean_xml/loncapa.xsd	2015/04/27 20:39:01	1.3
+++ modules/damieng/clean_xml/loncapa.xsd	2015/04/29 15:31:27	1.4
@@ -734,14 +734,14 @@
     <xs:attribute name="checkboxvalue" type="xs:string">
       <xs:annotation>
         <xs:documentation>
-          Two-option checkboxes for
+          When there are only 2 option values, set this attribute to one of them in order to display checkboxes. A foil checkbox will have to be checked when the foil has the chosen option value.
         </xs:documentation>
       </xs:annotation>
     </xs:attribute>
     <xs:attribute name="checkboxoptions">
       <xs:annotation>
         <xs:documentation>
-          Checkbox options
+          Set to "nochoice" to avoid the display of the list of option values.
         </xs:documentation>
       </xs:annotation>
       <xs:simpleType>