=== modified file 'src/docbkx/en/dhis2_user_man_web_api.xml'
--- src/docbkx/en/dhis2_user_man_web_api.xml	2012-04-03 21:59:27 +0000
+++ src/docbkx/en/dhis2_user_man_web_api.xml	2013-03-06 11:05:16 +0000
@@ -1145,12 +1145,12 @@
                 <entry>Not possible to define dimension items for categories</entry>
               </row>
               <row>
-                <entry>Data element group sets</entry>
+                <entry>Data element group sets (compulsory only)</entry>
                 <entry>&lt;group set id></entry>
                 <entry>Data element group identifiers (omit to get all items)</entry>
               </row>
               <row>
-                <entry>Organisation unit group sets</entry>
+                <entry>Organisation unit group sets (compulsory only)</entry>
                 <entry>&lt;group set id></entry>
                 <entry>Organisation unit group identifiers (omit to get all items)</entry>
               </row>
@@ -1198,6 +1198,10 @@
           organisation unit in the hierarchy.</para>
       </listitem>
       <listitem>
+        <para>Only compulsory data element and organisation unit group sets are available. Make sure
+          you set the group sets you want to use for analysis to be compulsory.</para>
+      </listitem>
+      <listitem>
         <para>You cannot specify dimension items for the category dimension. Instead the response
           will contain the categories which are linked to the data values.</para>
       </listitem>