diff --git a/src/pocketmine/scheduler/TaskHandler.php b/src/pocketmine/scheduler/TaskHandler.php
index 42114a58a..70b9f7ba5 100644
--- a/src/pocketmine/scheduler/TaskHandler.php
+++ b/src/pocketmine/scheduler/TaskHandler.php
@@ -127,6 +127,10 @@ class TaskHandler{
 		return $this->period;
 	}
 
+	/**
+	 * WARNING: Do not use this, it's only for internal use.
+	 * Changes to this function won't be recorded on the version.
+	 */
 	public function cancel(){
 		if(!$this->isCancelled()){
 			$this->task->onCancel();
@@ -156,4 +160,4 @@ class TaskHandler{
 
 		return get_class($this->task);
 	}
-}
\ No newline at end of file
+}