diff --git a/docs/examples/viz_play_cube.py b/docs/examples/viz_play_cube.py
index 82881c1e3..0cd663c10 100644
--- a/docs/examples/viz_play_cube.py
+++ b/docs/examples/viz_play_cube.py
@@ -99,6 +99,7 @@ def timer_callback(_caller, _timer_event):
 show_manager.add_timer_callback(True, int(1/60), timer_callback)
 
 
+######################################################################
 # Flip it to ``True`` for video.
 interactive = False
 if interactive: