1 files changed, 3 insertions, 0 deletions

diff --git a/Misc/NEWS b/Misc/NEWS
index 77cce0a8da..6c3cb7c824 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -84,6 +84,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #21487: Optimize ipaddress.summarize_address_range() and
+  ipaddress.{IPv4Network,IPv6Network}.subnets().
+
 - Issue #21486: Optimize parsing of netmasks in ipaddress.IPv4Network and
   ipaddress.IPv6Network.