diff --git a/README.md b/README.md
index 9ceb18ae..70a3314d 100644
--- a/README.md
+++ b/README.md
@@ -311,7 +311,7 @@ try {
     $issueService = new IssueService();
     
     // get issue's time tracking info
-    $ret = $issueService->getWorklog($this->issueKey);
+    $ret = $issueService->getTimeTracking($this->issueKey);
     var_dump($ret);
     
     $timeTracking = new TimeTracking;
@@ -320,7 +320,7 @@ try {
     $timeTracking->setRemainingEstimate('1w 2d 3h');
     
     // add time tracking
-    $ret = $issueService->worklog($this->issueKey, $timeTracking);
+    $ret = $issueService->timeTracking($this->issueKey, $timeTracking);
     var_dump($ret);
 } catch (JIRAException $e) {
     $this->assertTrue(false, 'testSearch Failed : '.$e->getMessage());
diff --git a/src/Issue/IssueField.php b/src/Issue/IssueField.php
index d98f5aef..0af39c78 100644
--- a/src/Issue/IssueField.php
+++ b/src/Issue/IssueField.php
@@ -150,7 +150,7 @@ public function getIssueType()
     public $progress;
 
     /** @var TimeTracking */
-    public $timetracking;
+    public $timeTracking;
 
     /** @var IssueType */
     public $issuetype;
diff --git a/src/Issue/IssueService.php b/src/Issue/IssueService.php
index 700ba480..20820219 100644
--- a/src/Issue/IssueService.php
+++ b/src/Issue/IssueService.php
@@ -223,32 +223,32 @@ public function search($jql, $startAt=0, $maxResults=15, $fields=[])
     }
 
     /**
-     * get worklog info
+     * get TimeTracking info
      * 
      * @param type $issueIdOrKey 
      * @return type @TimeTracking
      */
-    public function getWorklog($issueIdOrKey)
+    public function getTimeTracking($issueIdOrKey)
     {
         $ret = $this->exec($this->uri . "/$issueIdOrKey", null);
-        $this->log->addDebug("getWorklog res=$ret\n");
+        $this->log->addDebug("getTimeTracking res=$ret\n");
 
         $issue = $this->json_mapper->map(
              json_decode($ret), new Issue()
         );
 
-        return $issue->fields->timetracking;
+        return $issue->fields->timeTracking;
     }
 
      /**
-     * worklog issues
+     * TimeTracking issues
      *
      * @param issueIdOrKey Issue id or key
      * @param timeTracking   TimeTracking
      *
-     * @return TimeTracking
+     * @return type @TimeTracking
      */
-    public function worklog($issueIdOrKey, $timeTracking)
+    public function timeTracking($issueIdOrKey, $timeTracking)
     {   
         $array = ["update" =>
             [
@@ -260,16 +260,12 @@ public function worklog($issueIdOrKey, $timeTracking)
 
         $data = json_encode($array);
 
-        $this->log->addDebug("worklog req=$data\n");
+        $this->log->addDebug("TimeTracking req=$data\n");
 
+        // if success, just return HTTP 201.
         $ret = $this->exec($this->uri . "/$issueIdOrKey", $data, 'PUT');   
 
-        // FIXME 
-        $result = $this->json_mapper->map(
-            json_decode($ret), new TimeTracking()
-        );
-
-        return $result;
+        return $ret;
     }
 }
 
diff --git a/tests/TimeTrackingTest.php b/tests/TimeTrackingTest.php
index d0c10e77..ce6b7023 100644
--- a/tests/TimeTrackingTest.php
+++ b/tests/TimeTrackingTest.php
@@ -7,14 +7,14 @@
 
 class TimeTrackingTest extends PHPUnit_Framework_TestCase
 {    
-    private $issueKey = 'TEST-961';
+    private $issueKey = 'TEST-76';
 
     public function testGetTimeTracking()
     {   
         try {
             $issueService = new IssueService();
 
-            $ret = $issueService->getWorklog($this->issueKey);
+            $ret = $issueService->getTimeTracking($this->issueKey);
             var_dump($ret);
         } catch (JIRAException $e) {
             $this->assertTrue(false, 'testGetTimeTracking Failed : '.$e->getMessage());
@@ -31,7 +31,7 @@ public function testPostTimeTracking()
         try {
             $issueService = new IssueService();
             
-            $ret = $issueService->worklog($this->issueKey, $timeTracking);
+            $ret = $issueService->timeTracking($this->issueKey, $timeTracking);
             var_dump($ret);
         } catch (JIRAException $e) {
             $this->assertTrue(false, 'testPostTimeTracking Failed : '.$e->getMessage());