diff --git a/lib/Data/AbstractData.php b/lib/Data/AbstractData.php
index 6a14f3a..77600f9 100644
--- a/lib/Data/AbstractData.php
+++ b/lib/Data/AbstractData.php
@@ -129,7 +129,7 @@ abstract class AbstractData
      * @param  string $pasteid
      * @param  string $parentid
      * @param  string $commentid
-     * @return void
+     * @return bool
      */
     abstract public function existsComment($pasteid, $parentid, $commentid);
 
diff --git a/lib/Data/Database.php b/lib/Data/Database.php
index f5aa8be..d774439 100644
--- a/lib/Data/Database.php
+++ b/lib/Data/Database.php
@@ -306,7 +306,7 @@ class Database extends AbstractData
      *
      * @access public
      * @param  string $pasteid
-     * @return void
+     * @return bool
      */
     public function exists($pasteid)
     {
@@ -394,7 +394,7 @@ class Database extends AbstractData
      * @param  string $pasteid
      * @param  string $parentid
      * @param  string $commentid
-     * @return void
+     * @return bool
      */
     public function existsComment($pasteid, $parentid, $commentid)
     {
diff --git a/lib/Data/Filesystem.php b/lib/Data/Filesystem.php
index 60b15d4..eabc271 100644
--- a/lib/Data/Filesystem.php
+++ b/lib/Data/Filesystem.php
@@ -138,7 +138,7 @@ class Filesystem extends AbstractData
      *
      * @access public
      * @param  string $pasteid
-     * @return void
+     * @return bool
      */
     public function exists($pasteid)
     {
@@ -214,7 +214,7 @@ class Filesystem extends AbstractData
      * @param  string $pasteid
      * @param  string $parentid
      * @param  string $commentid
-     * @return void
+     * @return bool
      */
     public function existsComment($pasteid, $parentid, $commentid)
     {
@@ -325,7 +325,7 @@ class Filesystem extends AbstractData
      * @access private
      * @static
      * @param  string $dataid
-     * @return void
+     * @return string
      */
     private static function _dataid2path($dataid)
     {
@@ -341,7 +341,7 @@ class Filesystem extends AbstractData
      * @access private
      * @static
      * @param  string $dataid
-     * @return void
+     * @return string
      */
     private static function _dataid2discussionpath($dataid)
     {
diff --git a/lib/Model/AbstractModel.php b/lib/Model/AbstractModel.php
index 7f3c669..c1579b1 100644
--- a/lib/Model/AbstractModel.php
+++ b/lib/Model/AbstractModel.php
@@ -110,7 +110,7 @@ abstract class AbstractModel
      */
     public function setData($data)
     {
-        if (!sjcl::isValid($data)) {
+        if (!Sjcl::isValid($data)) {
             throw new Exception('Invalid data.', 61);
         }
         $this->_data->data = $data;