diff --git a/grails-app/controllers/org/transmartproject/rest/ExportController.groovy b/grails-app/controllers/org/transmartproject/rest/ExportController.groovy
index 53be7ad..cb94575 100644
--- a/grails-app/controllers/org/transmartproject/rest/ExportController.groovy
+++ b/grails-app/controllers/org/transmartproject/rest/ExportController.groovy
@@ -26,7 +26,7 @@ class ExportController {
     }
 
     /**GET request on /export/datatypes
-     *  Returns datatypes and patient number of given concepts.
+     *  Returns datatypes and list with subjects of given concepts.
      *
      */
     def datatypes() throws NoSuchResourceException {
diff --git a/src/groovy/org/transmartproject/rest/marshallers/DataTypeSerializationHelper.groovy b/src/groovy/org/transmartproject/rest/marshallers/DataTypeSerializationHelper.groovy
index d5f3f9c..14aa5b9 100644
--- a/src/groovy/org/transmartproject/rest/marshallers/DataTypeSerializationHelper.groovy
+++ b/src/groovy/org/transmartproject/rest/marshallers/DataTypeSerializationHelper.groovy
@@ -1,17 +1,17 @@
 package org.transmartproject.rest.marshallers
 
-import org.transmartproject.export.DataTypeRetrieved
+import org.transmartproject.export.Datatypes
 
-class DataTypeSerializationHelper  extends AbstractHalOrJsonSerializationHelper<DataTypeRetrieved>{
+class DataTypeSerializationHelper  extends AbstractHalOrJsonSerializationHelper<Datatypes>{
 
-    final Class targetType = DataTypeRetrieved
-    final String collectionName = 'dataTypeRetrieved'
+    final Class targetType = Datatypes
+    final String collectionName = 'datatypes'
 
     @Override
-    Map<String, Object> convertToMap(DataTypeRetrieved dataTypeRetrieved) {
+    Map<String, Object> convertToMap(Datatypes datatypes) {
         def cohortInfoList = []
         def cohortsMap = [:]
-        dataTypeRetrieved.OntologyTermsMap.each { ID, terms ->
+        datatypes.OntologyTermsMap.each { ID, terms ->
             terms.collect { term ->
                 if (ID in cohortsMap.keySet()) {
                     cohortsMap[ID].add([subjects: term.patients.collect({ it.id }), conceptPath: term.fullName])
@@ -23,8 +23,8 @@ class DataTypeSerializationHelper  extends AbstractHalOrJsonSerializationHelper<
         cohortsMap.each{ key, value ->
             cohortInfoList.add([concepts:value])
         }
-        def datatypeMap = [dataType:dataTypeRetrieved.dataType,
-                           dataTypeCode: dataTypeRetrieved.dataTypeCode,
+        def datatypeMap = [dataType:datatypes.dataType,
+                           dataTypeCode: datatypes.dataTypeCode,
                            cohorts:cohortInfoList]
     }
 
diff --git a/test/functional/org/transmartproject/rest/ExportTests.groovy b/test/functional/org/transmartproject/rest/ExportTests.groovy
index 13f1017..ed6a604 100644
--- a/test/functional/org/transmartproject/rest/ExportTests.groovy
+++ b/test/functional/org/transmartproject/rest/ExportTests.groovy
@@ -9,8 +9,7 @@ class ExportTests extends ResourceTestCase{
     String version = "v1"
 
 
-    private static final String JSON_CONCEPTS_DATATYPES_URI = "%5B%7B%22conceptKeys%22%3A+%5B%22%5C%5C%5C%5Ci2b2+main%5C%5Cfoo%5C%5Cstudy1%5C%5Cbar%5C%5C%22%5D%7D%2C+%7B%22conceptKeys%22%3A+%5B%22%5C%5C%5C%5Ci2b2+main%5C%5Cfoo%5C%5Cstudy2%5C%5Clong+path%5C%5C%22%2C+%22%5C%5C%5C%5Ci2b2+main%5C%5Cfoo%5C%5Cstudy2%5C%5Csex%5C%5C%22%5D%7D%5D"
-
+    private static final String JSON_CONCEPTS_DATATYPES_URI = "%7B%22cohorts%22%3A%20%5B%7B%22conceptKeys%22%3A%20%5B%22%5C%5C%5C%5Ci2b2%20main%5C%5Cfoo%5C%5Cstudy1%5C%5Cbar%5C%5C%22%5D%7D%2C%20%7B%22conceptKeys%22%3A%20%5B%22%5C%5C%5C%5Ci2b2%20main%5C%5Cfoo%5C%5Cstudy2%5C%5Clong%20path%5C%5C%22%2C%20%22%5C%5C%5C%5Ci2b2%20main%5C%5Cfoo%5C%5Cstudy2%5C%5Csex%5C%5C%22%5D%7D%5D%7D"
     void testDataTypes() {
         get("${baseURL}$version/export/datatypes", { concepts=JSON_CONCEPTS_DATATYPES_URI })
         assertStatus 200