diff --git a/lib/private/subadmin.php b/lib/private/subadmin.php
index 8cda7240ac92f8865ae61f3d6102129ec4aba5f1..5b6072987ad54eb459f2beafd2b92f33a9942c57 100644
--- a/lib/private/subadmin.php
+++ b/lib/private/subadmin.php
@@ -32,8 +32,8 @@ class OC_SubAdmin{
 
 	/**
 	 * @brief add a SubAdmin
-	 * @param $uid uid of the SubAdmin
-	 * @param $gid gid of the group
+	 * @param string $uid uid of the SubAdmin
+	 * @param string $gid gid of the group
 	 * @return boolean
 	 */
 	public static function createSubAdmin($uid, $gid) {
@@ -45,8 +45,8 @@ class OC_SubAdmin{
 
 	/**
 	 * @brief delete a SubAdmin
-	 * @param $uid uid of the SubAdmin
-	 * @param $gid gid of the group
+	 * @param string $uid uid of the SubAdmin
+	 * @param string $gid gid of the group
 	 * @return boolean
 	 */
 	public static function deleteSubAdmin($uid, $gid) {
@@ -58,7 +58,7 @@ class OC_SubAdmin{
 
 	/**
 	 * @brief get groups of a SubAdmin
-	 * @param $uid uid of the SubAdmin
+	 * @param string $uid uid of the SubAdmin
 	 * @return array
 	 */
 	public static function getSubAdminsGroups($uid) {
@@ -73,7 +73,7 @@ class OC_SubAdmin{
 
 	/**
 	 * @brief get SubAdmins of a group
-	 * @param $gid gid of the group
+	 * @param string $gid gid of the group
 	 * @return array
 	 */
 	public static function getGroupsSubAdmins($gid) {
@@ -102,8 +102,8 @@ class OC_SubAdmin{
 
 	/**
 	 * @brief checks if a user is a SubAdmin of a group
-	 * @param $uid uid of the subadmin
-	 * @param $gid gid of the group
+	 * @param string $uid uid of the subadmin
+	 * @param string $gid gid of the group
 	 * @return bool
 	 */
 	public static function isSubAdminofGroup($uid, $gid) {
@@ -118,7 +118,7 @@ class OC_SubAdmin{
 
 	/**
 	 * @brief checks if a user is a SubAdmin
-	 * @param $uid uid of the subadmin
+	 * @param string $uid uid of the subadmin
 	 * @return bool
 	 */
 	public static function isSubAdmin($uid) {
@@ -138,8 +138,8 @@ class OC_SubAdmin{
 
 	/**
 	 * @brief checks if a user is a accessible by a subadmin
-	 * @param $subadmin uid of the subadmin
-	 * @param $user uid of the user
+	 * @param string $subadmin uid of the subadmin
+	 * @param string $user uid of the user
 	 * @return bool
 	 */
 	public static function isUserAccessible($subadmin, $user) {