Add link to survey by Steven D, and summarize the two responses so far.

pep-0479.txt

@@ -174,6 +174,11 @@ ever, a problem. [4]_  Code does exist which relies on the current
 behaviour (e.g. [2]_, [5]_, [6]_), and there is the concern that this
 would be unnecessary code churn to achieve little or no gain.
 
+Steven D'Aprano started an informal survey on comp.lang.python [9]_;
+at the time of writing only two responses have been received: one was
+in favor of changing list comprehensions to match generator
+expressions (!), the other was in favor of this PEP's main proposal.
+
 
 References
 ==========
@@ -202,6 +207,9 @@ References
 .. [8] Coroutines in asyncio
    (https://docs.python.org/3/library/asyncio-task.html#coroutines)
 
+.. [9] Thread on comp.lang.python started by Steven D'Aprano
+   (https://mail.python.org/pipermail/python-list/2014-November/680757.html)
+
 Copyright
 =========