diff --git a/taskflow/task.py b/taskflow/task.py
index c34a13bf..a3d54e9a 100644
--- a/taskflow/task.py
+++ b/taskflow/task.py
@@ -141,7 +141,6 @@ class BaseTask(atom.Atom):
                                  when false the listeners will be emptied, when
                                  true the listeners will be copied and retained
 
-        :rtype: task
         :return: the copied task
         """
         c = copy.copy(self)