diff --git a/word_blocks/06_control/04_control_forever.py b/word_blocks/06_control/04_control_forever.py
index 340099d..ec57b10 100644
--- a/word_blocks/06_control/04_control_forever.py
+++ b/word_blocks/06_control/04_control_forever.py
@@ -1,3 +1,4 @@
 # Control forever
 while True:
-    pass # replace with your code to repeat forever
+    # Put your code to repeat forever here, but keep next line. Otherwise, hub may become unresponsive.
+    yield