diff --git a/src/NodaGroup.php b/src/NodaGroup.php
index 5df79b7..3af9aa7 100644
--- a/src/NodaGroup.php
+++ b/src/NodaGroup.php
@@ -101,7 +101,11 @@ final class NodaGroup {
     /**
      * Updates a group.
      *
-     * @retun void
+     * @param integer $group_id ID of the group to update.
+     * @param string  $name     Name of the group.
+     * @param string  $comment  Optional: Comment for the group.
+     *
+     * @return void
      */
     public function update(int $group_id, string $name, string $comment = ''):void {
 
@@ -123,7 +127,9 @@ final class NodaGroup {
     /**
      * Deletes a group.
      *
-     * @retun void
+     * @param integer $group_id ID of the group to delete.
+     *
+     * @return void
      */
     public function delete(int $group_id):void {