diff --git a/htdocs/lib/Study/StudyManager.php b/htdocs/lib/Study/StudyManager.php
index dd12778..c845c53 100644
--- a/htdocs/lib/Study/StudyManager.php
+++ b/htdocs/lib/Study/StudyManager.php
@@ -26,8 +26,8 @@ class StudyManager {
 
     /**
      * 取得目前已進入的學習點
-     * @param string $activity_id 活動編號
-     * @return string 標的編號，若無則null
+     * @param int $activity_id 活動編號
+     * @return int 標的編號，若無則null
      */
     public function getCurrentInTargetId($activity_id) {
 
diff --git a/htdocs/lib/Target/Target.php b/htdocs/lib/Target/Target.php
index 7c72a88..37994a1 100644
--- a/htdocs/lib/Target/Target.php
+++ b/htdocs/lib/Target/Target.php
@@ -267,7 +267,7 @@ class Target {
      * @param int $number 學習標的目前人數
      * @since 2.0.0
      */
-    function setMj($number){
+    public function setMj($number){
         $this->setUpdate('Mj', $number);
     }
 
@@ -280,7 +280,7 @@ class Target {
      * @return int 學習標的目前人數
      * @since 2.0.0
      */
-    function addMj($number){
+    public unction addMj($number){
         $setedNum = $this->queryResultArray['Mj']+$number;
         if($setedNum < 0) $setedNum = 0;
         $this->setUpdate('Mj', $setedNum);