Issue #8685: Speed up set difference `a - b` when source set `a` is
much larger than operand `b`. Patch by Andrew Bennetts.
diff --git a/Misc/NEWS b/Misc/NEWS
index 470fcff..6d8371c 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,9 @@
Core and Builtins
-----------------
+- Issue #8685: Speed up set difference ``a - b`` when source set ``a`` is
+ much larger than operand ``b``. Patch by Andrew Bennetts.
+
- Issue #10518: Bring back the callable() builtin.
- Issue #8879. Add os.link support for Windows.