diff --git a/iblrig/base_tasks.py b/iblrig/base_tasks.py
index 2c16d2598..7a60cdfaa 100644
--- a/iblrig/base_tasks.py
+++ b/iblrig/base_tasks.py
@@ -1591,6 +1591,8 @@ def _run(self):
                 break
             if self.stopped:
                 break
+        # Create the transfer flag file when the session finishes.
+        self.paths.SESSION_FOLDER.joinpath('transfer_me.flag').touch()
 
 
 class SpontaneousBpodSession(SpontaneousSession, BpodMixin):
diff --git a/iblrig_tasks/_iblrig_tasks_passiveChoiceWorld/task.py b/iblrig_tasks/_iblrig_tasks_passiveChoiceWorld/task.py
index 775f07b7a..e62cdad33 100644
--- a/iblrig_tasks/_iblrig_tasks_passiveChoiceWorld/task.py
+++ b/iblrig_tasks/_iblrig_tasks_passiveChoiceWorld/task.py
@@ -125,6 +125,8 @@ def _run(self):
                 self.bonsai_visual_udp_client.send_message(r'/re', byte_hide_stim)
             if self.stopped:
                 break
+        # Create the transfer flag when the task finishes.
+        self.paths.SESSION_FOLDER.joinpath('transfer_me.flag').touch()
 
 
 if __name__ == '__main__':  # pragma: no cover