diff --git a/CHANGES.rst b/CHANGES.rst
index a38c073cf471a4ee63e09850ffbdf516df45c806..2f15f3f63ccf4bfc92303027fd4368e2859673a7 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -42,6 +42,9 @@ Enhancements
 - Hub objects now include the value of their ``name`` attribute in
   their repr.
 
+- Pools for greenlets and threads have lower overhead, especially for
+  ``map``. See :pr:`1153`.
+
 Monitoring and Debugging
 ------------------------