Add section on weak references.
diff --git a/PriorDiscussion.md b/PriorDiscussion.md
index 4efc5fa..739ffe0 100644
--- a/PriorDiscussion.md
+++ b/PriorDiscussion.md
@@ -54,3 +54,7 @@
### Add warnings to the Go compiler
Rejected.
+
+### Weak references
+
+Unlikely to be added. See discussion at https://groups.google.com/forum/#!topic/golang-nuts/PYWxjT2v6ps, and https://groups.google.com/forum/?pli=1#!topic/golang-nuts/MMWXRANh0-g which points out that `sync.Pool` is a specific form of weak reference.
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