diff --git a/16-coroutine/coroaverager3.py b/16-coroutine/coroaverager3.py
index c89a3fd..32492bb 100644
--- a/16-coroutine/coroaverager3.py
+++ b/16-coroutine/coroaverager3.py
@@ -63,8 +63,11 @@ def averager(): # <1>
# the delegating generator
def grouper(results, key): # <5>
- while True: # <6>
- results[key] = yield from averager() # <7>
+ # while True: # <6>
+ results[key] = yield from averager() # <7>
+ # When group.send(None) is called, group runs to the yield statement below
+ # without raising StopIteration and creating a useless new instance of averager
+ yield
# the client code, a.k.a. the caller
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